commit 7d9f58dd4acd70ca01a07657506a4f7fdda49e48
Author: Enix <enixcoda@gmail.com>
Date:   Fri Nov 1 17:45:48 2019 +0800

    Squashed 'packages/pjax/' content from commit 480334b
    
    git-subtree-dir: packages/pjax
    git-subtree-split: 480334b18253c721ba648675e90261f948e2bca0

diff --git a/.editorconfig b/.editorconfig
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--- /dev/null
+++ b/.editorconfig
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+# editorconfig.org
+root = true
+
+[*]
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+indent_style = space
+indent_size = 2
+
+[*.md]
+trim_trailing_whitespace = false
+
+[Makefile]
+indent_style = tab
diff --git a/.eslintignore b/.eslintignore
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--- /dev/null
+++ b/.eslintignore
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+pjax.js
+pjax.min.js
+*.json
diff --git a/.eslintrc.json b/.eslintrc.json
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--- /dev/null
+++ b/.eslintrc.json
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+{
+  "extends": ["eslint-config-i-am-meticulous/es5"],
+  "rules": {
+    "import/order": "off",
+    "import/max-dependencies": "off",
+    "import/extensions": ["error", "never"]
+  }
+}
diff --git a/.gitignore b/.gitignore
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--- /dev/null
+++ b/.gitignore
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+.DS_Store
+node_modules/
+.nyc_output/
+.idea/
+dist/
+coverage/
+tests/scripts/index.html
+pjax.js
+pjax.min.js
diff --git a/.prettierignore b/.prettierignore
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index 0000000..2f36697
--- /dev/null
+++ b/.prettierignore
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+pjax.js
+pjax.min.js
+*.json
diff --git a/.travis.yml b/.travis.yml
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--- /dev/null
+++ b/.travis.yml
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+language: "node_js"
+node_js:
+  - "10"
+
diff --git a/CHANGELOG.md b/CHANGELOG.md
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--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,153 @@
+# 0.2.8 - 2019-03-09
+
+- Fixed: Edge form support.
+  ([#178](https://github.com/MoOx/pjax/pull/178) - @robinnorth)
+- Fixed: Removed keyup event listener for forms.
+  ([#184](https://github.com/MoOx/pjax/pull/184) - @BehindTheMath)
+- Fixed: Bugs in evalScripts().
+  ([#186](https://github.com/MoOx/pjax/pull/186) - @BehindTheMath)
+- Fixed: Handle non-string HTML passed to loadContent().
+  ([#200](https://github.com/MoOx/pjax/pull/200) - @BehindTheMath)
+- Tooling: Switch linting to ESLint and Prettier.
+  ([#191](https://github.com/MoOx/pjax/pull/191) - @BehindTheMath)
+
+# 0.2.7 - 2018-08-15
+
+- Fixed: Parsing values of option elements in forms.
+  ([#162](https://github.com/MoOx/pjax/pull/162) - @BehindTheMath)
+- Fixed: Added index.d.ts to package.json so it will be installed by npm.
+  ([c589ab9](https://github.com/MoOx/pjax/commit/c589ab9c25bee6161bf3e557eaca44e51c14fb89) - @BehindTheMath)
+- Fixed: `options.history` to correctly parse being set to false.
+  ([#165](https://github.com/MoOx/pjax/pull/165) - @BehindTheMath).
+- Fixed: Pass the current `options` object to `loadContent()`.
+  ([#171](https://github.com/MoOx/pjax/pull/171) - @BehindTheMath)
+- Fixed: Ensure correct XHR encoding for multipart/form-data forms
+  ([#174](https://github.com/MoOx/pjax/pull/174) - @BehindTheMath)
+- Added: More documentation.
+  ([#160](https://github.com/MoOx/pjax/pull/160), [#171](https://github.com/MoOx/pjax/pull/171) - @robinnorth, @BehindTheMath)
+
+# 0.2.6 - 2018-04-30
+
+- Fixed: Form submission for GET requests.
+  ([#129](https://github.com/MoOx/pjax/pull/129) - @robinnorth)
+- Fixed: Refactor `loadUrl()` to make manually calling simpler.
+  ([#134](https://github.com/MoOx/pjax/pull/134) - @robinnorth)
+- Fixed: Support multiple select fields in form submissions.
+  ([#147](https://github.com/MoOx/pjax/pull/147) - @robinnorth)
+- Fixed: Use the same options object in `handle-response` as in `send-request`. This way, `pjax.state.options` will also have the request options.
+  ([#148](https://github.com/MoOx/pjax/pull/148) - @BehindTheMath)
+- Added: Move the XHR callback to a separate method, and trigger an error event if the response cannot be parsed.
+  ([#137](https://github.com/MoOx/pjax/pull/137) - @BehindTheMath)
+- Added: TypeScript definitions.
+  ([#138](https://github.com/MoOx/pjax/pull/138) - @BehindTheMath)
+- Added: `replaceNode` switch, as an alternative to the `outerHTML` switch.
+  ([#141](https://github.com/MoOx/pjax/pull/141) - @BehindTheMath)
+- Added: `X-PJAX-Selectors` HTTP header. This is a serialized JSON array of selectors, taken from `options.selectors`. You can use this to send back only the elements that Pjax will use to switch, instead of sending the whole page.
+  ([#144](https://github.com/MoOx/pjax/pull/144) - @BehindTheMath)
+- Added: An option to use `FormData` to submit forms.
+  ([#153](https://github.com/MoOx/pjax/pull/153) - @BehindTheMath)
+- Added: Tests.
+  ([f98f2dd](https://github.com/MoOx/pjax/commit/f98f2dd63b48113ff91b6bd8808257bfc723ef6b), [#145](https://github.com/MoOx/pjax/pull/145) - @robinnorth, @BehindTheMath)
+
+# 0.2.5 - 2018-02-02
+
+- Fixed: Async switch functions now work correctly, because the DOM is now parsed after all the switches finish.
+  ([#79](https://github.com/MoOx/pjax/pull/79), [#110](https://github.com/MoOx/pjax/pull/110) - @oskarrough, @BehindTheMath, @robinnorth)
+- Fixed: Bug on IE11 preventing AJAX page refresh.
+  ([#81](https://github.com/MoOx/pjax/pull/81) - @CPTechnikVX)
+- Fixed: Default switches are now available as `Pjax.switches`.
+  ([#92](https://github.com/MoOx/pjax/pull/92) - @BehindTheMath)
+- Fixed: An error that was caused by a missing `switchElementsAlt`.
+  ([#93](https://github.com/MoOx/pjax/pull/93), [#104](https://github.com/MoOx/pjax/pull/104) - @BehindTheMath, @robinnorth)
+- Fixed: Incorrect `main` field in npm package
+  ([#105](https://github.com/MoOx/pjax/pull/105) - @robinnorth)
+- Fixed: A pending XHR is now aborted if the user navigates somewhere else before the request is finished.
+  ([#114](https://github.com/MoOx/pjax/pull/114) - @robinnorth)
+- Fixed: When rendering new content, focus will now be removed only from elements within one of the containers manipulated by Pjax.
+  ([#116](https://github.com/MoOx/pjax/pull/116) - @BehindTheMath)
+- Fixed: Stop dispatching extraneous `pjax:complete` events when external scripts load
+  ([#118](https://github.com/MoOx/pjax/pull/118) - @robinnorth)
+- Added: Send the `X-PJAX` header with XHR requests.
+  ([#80](https://github.com/MoOx/pjax/pull/80) - @bram1028)
+- Added: Direct download link for script tags. (@MoOx)
+- Added: Pass the element that triggered Pjax to the `pjax:send` event.
+  ([#94](https://github.com/MoOx/pjax/pull/94) - @BehindTheMath)
+- Added: An option to set a timeout for XHR requests.
+  ([#95](https://github.com/MoOx/pjax/pull/95) - @BehindTheMath)
+- Added: Checks for XHR redirects
+  ([#101](https://github.com/MoOx/pjax/pull/101) - @BehindTheMath)
+- Added: Save scroll position with history, and restore when navigating backwards or forwards.
+  ([#110](https://github.com/MoOx/pjax/pull/110), [#119](https://github.com/MoOx/pjax/pull/119) - @BehindTheMath, @robinnorth)
+- Added: Scroll to element position when URL contains a hash
+  ([#110](https://github.com/MoOx/pjax/pull/110) - @BehindTheMath)
+- Added: Minified version of the Pjax bundle.
+  ([#115](https://github.com/MoOx/pjax/pull/115) - @BehindTheMath)
+- Changed: Miscellaneous code and tests cleanup.
+  ([#96](https://github.com/MoOx/pjax/pull/96), [#98](https://github.com/MoOx/pjax/pull/98), [#99](https://github.com/MoOx/pjax/pull/99), [#100](https://github.com/MoOx/pjax/pull/1070), [#107](https://github.com/MoOx/pjax/pull/107), [#113](https://github.com/MoOx/pjax/pull/113), [#120](https://github.com/MoOx/pjax/pull/120) - @BehindTheMath, @MoOx, @robinnorth)
+
+# 0.2.4 - 2016-06-28
+
+- Fixed: ``refresh`` should now work (use `this.parseDOM` for refresh)
+  ([#67](https://github.com/MoOx/pjax/pull/67) - @compressed)
+- Fixed: Some attributes, such as `itemscope` have no corresponding value.
+  This change allows them to still be set.
+  ([#67](https://github.com/MoOx/pjax/pull/67) - @compressed)
+- Added: ``cacheBust`` option
+  ([#71](https://github.com/MoOx/pjax/pull/71) - @tremby)
+
+# 0.2.3 - 2016-03-24
+
+- Fixed: ``currentUrlFullReload`` option now works
+- Fixed: ``this.reload`` is now a Function
+  ([#65](https://github.com/MoOx/pjax/issues/65))
+
+# 0.2.2 - 2016-03-12
+
+- Fixed: added back standalone version in `./pjax.js`
+([#57](https://github.com/MoOx/pjax/issues/57)
+- Fixed: error when using pjax with google analytics (``options`` was undefined)
+([#59](https://github.com/MoOx/pjax/pull/59))
+- Fixed: HierarchyRequestError error
+([#49](https://github.com/MoOx/pjax/pull/49))
+- Fixed: ``TypeError: Pjax.forEachEls is not a function``
+([#52](https://github.com/MoOx/pjax/pull/52))
+- Fixed: ``TypeError: Pjax.executeScripts is not a function``
+([#52](https://github.com/MoOx/pjax/pull/52))
+- Fixed: ``TypeError: Pjax.clone is not a function``
+([#52](https://github.com/MoOx/pjax/pull/52))
+- Added: Ignore events with prevented defaults
+([#50](https://github.com/MoOx/pjax/pull/50))
+
+# 0.2.1 - 2015-02-04
+
+- Fixed: it's better when a release have actual files.
+
+# 0.2.0 - 2015-02-04
+
+- Fixed: prevent scrollTo from being converted from false to 0 ([#33](https://github.com/MoOx/pjax/pull/33))
+- Changed: code exploded in commonjs style
+- Added: lots of tests
+- Added: `refresh` method to force update a DOM element ([#36](https://github.com/MoOx/pjax/pull/36))
+
+# 0.1.4 - 2014-10-14
+
+- Fixed: allow to load pages without any attributes on `<html>` element (fix [#6](https://github.com/MoOx/pjax/issues/6))
+- Fixed: make `Pjax.switches.sideBySide` method usable (fix [#13](https://github.com/MoOx/pjax/issues/13))
+
+# 0.1.3 - 2014-09-16
+
+- Fixed: clicking on the current url somewhere does not produce a full reload by default (see option `currentUrlFullReload`)
+- Fixed: `document.implementation.createHTMLDocument` error (in IE10, ref [#16](https://github.com/MoOx/pjax/pull/16))
+
+# 0.1.2 - 2014-04-03
+
+- Changed: `pjax.js` relocated in `src/`
+- Fixed: `<html>` attributes of pjaxified document are now available
+
+# 0.1.1 - 2014-04-02
+
+- Fixed: safer UMD wrapper (fix concat issue)
+
+# 0.1.0 - 2014-03-24
+
+✨ Initial release
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+The MIT License (MIT)
+
+Copyright (c) 2014 Maxime Thirouin
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/README.md b/README.md
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+# Pjax
+
+[![Build Status](https://img.shields.io/travis/MoOx/pjax.svg)](https://travis-ci.org/MoOx/pjax).
+
+> Easily enable fast AJAX navigation on any website (using pushState() + XHR)
+
+Pjax is **a standalone JavaScript module** that uses [AJAX](https://developer.mozilla.org/en-US/docs/Web/Guide/AJAX) (XmlHttpRequest) and [pushState()](https://developer.mozilla.org/en-US/docs/Web/Guide/API/DOM/Manipulating_the_browser_history) to deliver a fast browsing experience.
+
+_It allows you to completely transform the user experience of standard websites (server-side generated or static ones) to make users feel like they are browsing an app, especially for those with low bandwidth connections._
+
+**No more full page reloads. No more multiple HTTP requests.**
+
+_Pjax does not rely on other libraries, like jQuery or similar. It is written entirely in vanilla JS._
+
+## Installation
+
+- You can link directly to the [bundle](https://cdn.jsdelivr.net/npm/pjax/pjax.js):
+  ```html
+  <script src="https://cdn.jsdelivr.net/npm/pjax@VERSION/pjax.js"></script>
+  ```
+
+- Or the [minified bundle](https://cdn.jsdelivr.net/npm/pjax/pjax.min.js):
+  ```html
+  <script src="https://cdn.jsdelivr.net/npm/pjax@VERSION/pjax.min.js"></script>
+  ```
+
+- You can also install Pjax from **npm**:
+  ```shell
+  npm install pjax
+  ```
+  **Note**: If you use this option, you will need to do one of the following:
+    - Link a script tag to either `pjax.js` or `pjax.min.js`. E.g.:
+    ```html
+    <script src="./node_modules/pjax/pjax.js"></script>
+    ```
+    - Use a bundler like Webpack. (`index.js` cannot be used in the browser without a bundler).
+
+- Or you can clone the repo and build the bundle from the source using npm:
+  ```shell
+  git clone https://github.com/MoOx/pjax.git
+  cd pjax
+  npm install
+  npm run build
+  ```
+  and then link a script tag to either `pjax.js` or `pjax.min.js`. E.g.:
+  ```html
+  <script src="./pjax.min.js"></script>
+  ```
+
+---
+
+## What Pjax Does
+
+_Under the hood, it's just ONE HTTP request with a `pushState()` call._
+
+Pjax loads pages using AJAX and updates the browser's current URL using `pushState()` _without_ reloading your page's layout or any resources (JS, CSS), giving a fast page load.
+
+It works with all permalinks and can update all the parts of the page you want (including HTML metas, title, and navigation state).
+
+In the case of [browsers that don't support `history.pushState()`](http://caniuse.com/#search=pushstate), Pjax gracefully degrades and does not do anything at all.
+
+Additionally, Pjax:
+
+- Is not limited to one container, like jQuery-Pjax is.
+- Fully supports browser history (back and forward buttons).
+- Supports keyboard browsing.
+- Automatically falls back to standard navigation for external pages (thanks to Captain Obvious's help).
+- Automatically falls back to standard navigation for internal pages that do not have an appropriate DOM tree.
+- Allows for CSS transitions (animations) very easily.
+- Is only around 6kb (minified and gzipped).
+
+## How Pjax Works
+
+- It listens to every click on links _you want_ (by default all of them).
+- When an internal link is clicked, Pjax fetches the page's HTML via AJAX.
+- Pjax renders the page's DOM tree (without loading any resources - images, CSS, JS, etc).
+- It checks that all defined parts can be replaced:
+    - If the page doesn't meet the requirements, standard navigation is used.
+    - If the page meets the requirements, Pjax does all defined DOM replacements.
+- Then it updates the browser's current URL using `pushState()`.
+
+## Overview
+
+_Pjax is fully automatic_. You don't need to change anything about your existing HTML,
+you just need to designate which elements on your page that you want to be replaced when your site is navigated.
+
+Consider the following page.
+
+```html
+<!DOCTYPE html>
+<html>
+<head>
+  <!-- metas, title, styles, etc -->
+  <title>My Cool Blog</title>
+  <meta name="description" content="Welcome to My Cool Blog">
+  <link href="/styles.css" rel="stylesheet">
+</head>
+
+<body>
+  <header class="the-header">
+    <nav>
+      <a href="/" class="is-active">Home</a>
+      <a href="/about">About</a>
+      <a href="/contact">Contact</a>
+    </nav>
+  </header>
+
+  <section class="the-content">
+    <h1>My Cool Blog</h1>
+    <p>
+      Thanks for stopping by!
+
+      <a href="/about">Click Here to find out more about me.</a>
+    </p>
+  </section>
+
+  <aside class="the-sidebar">
+    <h3>Recent Posts</h3>
+    <!-- sidebar content -->
+  </aside>
+
+  <footer class="the-footer">
+    &copy; My Cool Blog
+  </footer>
+
+  <script src="onDomReadystuff.js"></script>
+  <script>
+    // analytics
+  </script>
+</body>
+</html>
+```
+
+We want Pjax to intercept the URL `/about`, and replace `.the-content` with the resulting content of the request.
+
+It would also be nice if we could replace the `<nav>` to show that the `/about` link is active, as well as update our page meta and the `<aside>` sidebar.
+
+So all in all we want to update the page title and meta, header, content area, and sidebar, **without reloading styles or scripts**.
+
+We can easily do this by telling Pjax to listen on all `a` tags (which is the default) and use CSS selectors defined above (without forgetting minimal meta):
+
+``` javascript
+var pjax = new Pjax({
+  selectors: [
+    "title",
+    "meta[name=description]",
+    ".the-header",
+    ".the-content",
+    ".the-sidebar",
+  ]
+})
+```
+
+Now, when someone in a Pjax-compatible browser clicks an internal link on the page, the content of each of the selectors will be replaced with the specific content pieces found in the next page's content.
+
+_Magic! For real!_ **There is no need to do anything server-side!**
+
+## Differences with [jQuery-pjax](https://github.com/defunkt/jquery-pjax)
+
+- No jQuery dependency.
+- Not limited to a container.
+- No server-side requirements.
+- Works for CommonJS environment (Webpack/Browserify), AMD (RequireJS) or even globally.
+- Allows page transitions with CSS animations.
+- Can be easily tweaked, since every method is public (and as a result, overridable).
+
+## Compatibility
+
+Pjax only works with [browsers that support the `history.pushState()` API](http://caniuse.com/#search=pushstate). When the API isn't supported, Pjax goes into fallback mode (and it just does nothing).
+
+To see if Pjax is actually supported by your browser, use `Pjax.isSupported()`.
+
+## Usage
+
+### `new Pjax()`
+
+Let's talk more about the most basic way to get started.
+
+When instantiating `Pjax`, you can pass options into the constructor as an object:
+
+```js
+var pjax = new Pjax({
+  elements: "a", // default is "a[href], form[action]"
+  selectors: ["title", ".the-header", ".the-content", ".the-sidebar"]
+})
+```
+
+This will enable Pjax on all links, and designate the part to replace using CSS selectors `"title", ".the-header", ".the-content", ".the-sidebar"`.
+
+In some cases, you might want to only target some specific elements to apply Pjax behavior. In that case, you can do two different things:
+
+1. Use a custom CSS selector( such as `"a.js-Pjax"` or `".js-Pjax a"`, etc).
+2. Override `Pjax.prototype.getElements`.
+    - **Note**: If doing this, make sure to return a `NodeList`.
+
+```js
+// use case 1
+var pjax = new Pjax({ elements: "a.js-Pjax" })
+```
+
+```js
+// use case 2
+Pjax.prototype.getElements = function() {
+  return document.getElementsByClassName(".js-Pjax")
+}
+
+var pjax = new Pjax()
+```
+
+### `loadUrl(href, [options])`
+
+With this method, you can manually trigger the loading of a URL:
+
+```js
+var pjax = new Pjax()
+
+// use case 1
+pjax.loadUrl("/your-url")
+
+// use case 2 (with options override)
+pjax.loadUrl("/your-other-url", { timeout: 10 })
+```
+
+### `handleResponse(responseText, request, href, options)`
+
+This method takes the raw response, processes the URL, then calls `pjax.loadContent()` to actually load it into the DOM.
+
+It is passed the following arguments:
+
+* **responseText** (string): This is the raw response text. This is equivalent to `request.responseText`.
+* **request** (XMLHttpRequest): This is the XHR object.
+* **href** (string): This is the URL that was passed to `loadUrl()`.
+* **options** (object): This is an object with the options for this request. The structure basically matches the regular options object, with a few extra internal properties.
+
+You can override this if you want to process the data before, or instead of, it being loaded into the DOM.
+
+For example, if you want to check for a non-HTML response, you could do the following:
+
+```js
+var pjax = new Pjax();
+
+pjax._handleResponse = pjax.handleResponse;
+
+pjax.handleResponse = function(responseText, request, href, options) {
+  if (request.responseText.match("<html")) {
+    pjax._handleResponse(responseText, request, href, options);
+  } else {
+    // handle non-HTML response here
+  }
+}
+```
+
+### `refresh([el])`
+
+Use this method to bind Pjax to children of a DOM element that didn't exist when Pjax was initialised e.g. content inserted dynamically by another library or script. If called with no arguments, Pjax will parse the entire document again to look for newly-inserted elements.
+
+```js
+// Inside a callback or Promise that runs after new DOM content has been inserted
+var newContent = document.querySelector(".new-content");
+
+pjax.refresh(newContent);
+```
+
+
+### `reload()`
+
+A helper shortcut for `window.location.reload()`. Used to force a page reload.
+
+```js
+pjax.reload()
+```
+
+## Options
+
+### `elements` (String, default: `"a[href], form[action]"`)
+
+CSS selector(s) used to find links to apply Pjax to. If needing multiple specific selectors, separate them by a comma.
+
+```js
+// Single element
+var pjax = new Pjax({
+  elements: ".ajax"
+})
+```
+
+```js
+// Multiple elements
+var pjax = new Pjax({
+  elements: ".pjax, .ajax",
+})
+```
+
+### `selectors` (Array, default: `["title", ".js-Pjax"]`)
+
+CSS selectors used to find which content to replace.
+
+```js
+var pjax = new Pjax({
+  selectors: [
+    "title",
+    "the-content",
+  ]
+})
+```
+
+If a query returns multiples items, it will just keep the index.
+
+Example of what you can do:
+
+```html
+<!DOCTYPE html>
+<html>
+<head>
+  <title>Page title</title>
+</head>
+<body>
+  <header class="js-Pjax">...</header>
+  <section class="js-Pjax">...</section>
+  <footer class="the-footer">...</footer>
+  <script>...</script>
+</body>
+</html>
+```
+
+This example is correct and should work "as expected".
+
+**NOTE:** _If the current page and new page do not have the same amount of DOM elements, Pjax will fall back to normal page load._
+
+### `switches` (Object, default: `{}`)
+
+This is an object containing callbacks that can be used to switch old elements with new elements.
+
+The object keys should be one of the defined selectors (from the `selectors` option).
+
+Examples:
+
+```js
+var pjax = new Pjax({
+  selectors: ["title", ".Navbar", ".js-Pjax"],
+  switches: {
+    "title": Pjax.switches.outerHTML, // default behavior
+    ".the-content": function(oldEl, newEl, options) {
+      // this is identical to the default behavior
+      oldEl.outerHTML = newEl.outerHTML
+      this.onSwitch()
+    },
+    ".js-Pjax": Pjax.switches.sideBySide
+  }
+})
+```
+
+Callbacks are bound to the Pjax instance itself to allow you to reuse it (ex: `this.onSwitch()`)
+
+### Existing Switch Callbacks
+
+- `Pjax.switches.outerHTML`:
+  The default behavior, replaces elements using `outerHTML`.
+- `Pjax.switches.innerHTML`:
+  Replaces elements using `innerHTML` and copies `className`.
+- `Pjax.switches.replaceNode`:
+  Replaces elements using `replaceChild`
+- `Pjax.switches.sideBySide`:
+  Smart replacing that allows you to have both elements in the same parent when you want to use CSS animations. Old elements are removed when all children have been fully animated (an [animationEnd](http://www.w3.org/TR/css3-animations/#animationend) event is triggered).
+
+### Creating a Switch Callback
+
+Your callback function can do whatever you want, but you need to:
+
+1. Replace the `oldEl`'s content with the `newEl`'s content in some fashion.
+2. Call `this.onSwitch()` to trigger the attached callback.
+
+Here is the default behavior as an example:
+
+```js
+function(oldEl, newEl, pjaxOptions) {
+  oldEl.outerHTML = newEl.outerHTML
+  this.onSwitch()
+}
+```
+
+### `switchesOptions` (Object, default: `{}`)
+
+These are options that can be used during content replacement by switches. For now, only `Pjax.switches.sideBySide` uses it. This is very convenient when you use something like [Animate.css](https://github.com/daneden/animate.css) with or without [WOW.js](https://github.com/matthieua/WOW).
+
+```js
+var pjax = new Pjax({
+  selectors: ["title", ".js-Pjax"],
+  switches: {
+    ".js-Pjax": Pjax.switches.sideBySide
+  },
+  switchesOptions: {
+    ".js-Pjax": {
+      classNames: {
+        // class added to the old element being replaced, e.g. a fade out
+        remove: "Animated Animated--reverse Animate--fast Animate--noDelay",
+        // class added to the new element that is replacing the old one, e.g. a fade in
+        add: "Animated",
+        // class added on the element when navigating back
+        backward: "Animate--slideInRight",
+        // class added on the element when navigating forward (used for new page too)
+        forward: "Animate--slideInLeft"
+      },
+      callbacks: {
+        // to make a nice transition with 2 pages at the same time
+        // we are playing with absolute positioning for the element we are removing
+        // & we need live metrics to have something great
+        // see associated CSS below
+        removeElement: function(el) {
+          el.style.marginLeft = "-" + (el.getBoundingClientRect().width/2) + "px"
+        }
+      }
+    }
+  }
+})
+```
+
+_Note that `remove` includes `Animated--reverse` which is a simple way to not have to have a duplicate transition (slideIn + reverse => slideOut)._
+
+Here is some css that works well with the above configuration:
+
+```css
+/*
+  Note: If your content elements don't have a fixed width it can cause
+  an issue when positioning absolutely
+*/
+.js-Pjax { position: relative } /* parent element where switch will be made */
+
+.js-Pjax-child { width: 100% }
+
+/* position for the elements that will be removed */
+.js-Pjax-remove {
+  position: absolute;
+  left: 50%;
+  /* transform: translateX(-50%) */
+  /* transform can't be used since we already use generic translate for the remove effect (eg animate.css) */
+  /* margin-left: -width/2; // made with js */
+  /* you can totally drop the margin-left thing from switchesOptions if you use custom animations */
+}
+
+/* CSS animations */
+.Animated {
+  animation-fill-mode: both;
+  animation-duration: 1s;
+}
+
+.Animated--reverse { animation-direction: reverse }
+
+.Animate--fast { animation-duration: .5s }
+.Animate--noDelay { animation-delay: 0s !important;  }
+
+.Animate--slideInRight { animation-name: Animation-slideInRight }
+
+@keyframes Animation-slideInRight {
+  0% {
+    opacity: 0;
+    transform: translateX(100rem);
+  }
+
+  100% {
+    transform: translateX(0);
+  }
+}
+
+.Animate--slideInLeft { animation-name: Animation-slideInLeft }
+
+@keyframes Animation-slideInLeft {
+  0% {
+    opacity: 0;
+    transform: translateX(-100rem);
+  }
+
+  100% {
+    transform: translateX(0);
+  }
+}
+```
+
+To give context to this CSS, here is an HTML snippet:
+
+```html
+<!doctype html>
+<html>
+<head>
+  <title>Page Title</title>
+</head>
+<body>
+  <section class="js-Pjax">
+    <div class="js-Pjax-child">
+      Your content here
+    </div>
+    <!--
+    During the replacement process, you'll have the following tree:
+
+    <div class="js-Pjax-child js-Pjax-remove Animate...">
+      Your OLD content here
+    </div>
+    <div class="js-Pjax-child js-Pjax-add Animate...">
+      Your NEW content here
+    </div>
+
+    -->
+  </section>
+  <script>...</script>
+</body>
+</html>
+```
+
+### `history` (Boolean, default: `true`)
+
+Enable the use of `pushState()`. Disabling this will prevent Pjax from updating browser history. While possible, there is almost no use case where you would want to do this.
+
+Internally, this option is used when a `popstate` event triggers Pjax (to not `pushState()` again).
+
+### `analytics` (Function | Boolean, default: a function that pushes `_gaq` `_trackPageview` or sends `ga` `pageview`
+
+Function that allows you to add behavior for analytics. By default it tries to track
+a pageview with Google Analytics (if it exists on the page). It's called every time a page is switched, even for history navigation.
+
+Set to `false` to disable this behavior.
+
+### `scrollTo` (Integer | \[Integer, Integer\] | False, default: `0`)
+
+When set to an integer, this is the value (in px from the top of the page) to scroll to when a page is switched.
+
+When set to an array of 2 integers (\[x, y\]), this is the value to scroll both horizontally and vertically.
+
+Set this to `false` to disable scrolling, which will mean the page will stay in that same position it was before loading the new elements.
+
+### `scrollRestoration` (Boolean, default: `true`)
+
+When set to `true`, Pjax will attempt to restore the scroll position when navigating backwards or forwards.
+
+### `cacheBust` (Boolean, default: `true`)
+
+When set to `true`, Pjax appends a timestamp query string segment to the requested URL in order to skip the browser cache.
+
+### `debug` (Boolean, default: `false`)
+
+Enables verbose mode. Useful to debug page layout differences.
+
+### `currentUrlFullReload` (Boolean, default: `false`)
+
+When set to `true`, clicking on a link that points to the current URL will trigger a full page reload.
+
+When set to `false`, clicking on such a link will cause Pjax to load the current page without a full page reload. If you want to add some custom behavior, add a click listener to the link and call `preventDefault()`. This will prevent Pjax from receiving the event.
+
+**Note**: This must be done before Pjax is instantiated, otherwise Pjax's event handler will be called first, and `preventDefault()` won't have been called yet.
+
+Here is some sample code:
+
+```js
+  var links = document.querySelectorAll(".js-Pjax");
+
+  for (var i = 0; i < links.length; i++) {
+    var el = links[i]
+
+    el.addEventListener("click", function(e) {
+      if (el.href === window.location.href.split("#")[0]) {
+        e.preventDefault();
+
+        console.log("Link to current page clicked");
+        // Custom code goes here.
+      }
+    })
+  }
+
+  var pjax = new Pjax()
+```
+
+(Note that if `cacheBust` is set to `true`, the code that checks if the href is the same as the current page's URL will not work, due to the query string appended to force a cache bust).
+
+### `timeout` (Integer, default: `0`)
+
+The timeout in _milliseconds_ for the XHR requests. Set to `0` to disable the timeout.
+
+## Events
+
+Pjax fires a number of events regardless of how it's invoked.
+
+All events are fired from the _document_, not the link that was clicked.
+
+* `pjax:send` - Fired after the Pjax request begins.
+* `pjax:complete` - Fired after the Pjax request finishes.
+* `pjax:success` - Fired after the Pjax request succeeds.
+* `pjax:error` - Fired after the Pjax request fails. The request object will be passed along as `event.options.request`.
+
+`send` and `complete` are a good pair of events to use if you are implementing a loading indicator (eg: [topbar](http://buunguyen.github.io/topbar/))
+
+```js
+document.addEventListener('pjax:send', topbar.show)
+document.addEventListener('pjax:complete', topbar.hide)
+```
+
+## HTTP Headers
+
+Pjax uses several custom headers when it makes and receives HTTP requests. If the requests are going to your server, you can use those headers for some meta information about the response.
+
+### Request Headers
+
+Pjax sends the following headers with every request:
+
+- `X-Requested-With: "XMLHttpRequest"`
+- `X-PJAX: "true"`
+- `X-PJAX-Selectors`:
+    A serialized JSON array of selectors, taken from `options.selectors`. You can use this to send back only the elements that Pjax will use to switch, instead of sending the whole page. Note that you'll need to deserialize this on the server (Such as by using `JSON.parse()`)
+
+### Response Headers
+
+Pjax looks for the following headers on the response:
+
+- `X-PJAX-URL` or `X-XHR-Redirected-To`
+
+Pjax first checks the `responseURL` property on the XHR object to see if the request was redirected by the server. Most browsers support this, but not all. To ensure Pjax will be able to tell when the request is redirected, you can include one of these headers with the response, set to the final URL.
+
+## DOM Ready State
+
+Most of the time, you will have code related to the current DOM that you only execute when the DOM is ready.
+
+Since Pjax doesn't automatically re-execute your previous code each time you load a page, you'll need to add code to re-trigger the DOM ready code. Here's a simple example:
+
+```js
+function whenDOMReady() {
+  // do your stuff
+}
+
+whenDOMReady()
+
+var pjax = new Pjax()
+
+document.addEventListener("pjax:success", whenDOMReady)
+```
+
+_Note: Don't create the Pjax instance in the `whenDOMReady` function._
+
+If you want to just update a specific part (which is a good idea), you can add the DOM-related code in a function and re-execute this function when the `pjax:success` event is fired.
+
+```js
+// do your global stuff
+//... DOM ready code
+
+function whenContainerReady() {
+  // do your container related stuff
+}
+
+whenContainerReady()
+
+var pjax = new Pjax()
+
+document.addEventListener("pjax:success", whenContainerReady)
+```
+
+## FAQ
+
+### Q: Disqus doesn't work anymore, how can I fix that ?
+
+#### A: There are a few things you need to do:
+
+- Wrap your Disqus snippet into a DOM element that you will add to the `selector` property (or just wrap it with `class="js-Pjax"`) and be sure to have at least an empty wrapper on each page (to avoid differences of DOM between pages).
+
+- Edit your Disqus snippet like the one below.
+
+#### Disqus snippet _before_ Pjax integration
+
+```html
+<script>
+  var disqus_shortname = 'YOURSHORTNAME'
+  var disqus_identifier = 'PAGEID'
+  var disqus_url = 'PAGEURL'
+  var disqus_script = 'embed.js'
+
+  (function(d,s) {
+  s = d.createElement('script');s.async=1;s.src = '//' + disqus_shortname + '.disqus.com/'+disqus_script;
+  (d.getElementsByTagName('head')[0]).appendChild(s);
+  })(document)
+</script>
+```
+
+#### Disqus snippet _after_ Pjax integration
+
+```html
+<div class="js-Pjax"><!-- needs to be here on every Pjax-ified page, even if empty -->
+<!-- if (some condition) { // eventual server-side test to know whether or not you include this script -->
+  <script>
+    var disqus_shortname = 'YOURSHORTNAME'
+    var disqus_identifier = 'PAGEID'
+    var disqus_url = 'PAGEURL'
+    var disqus_script = 'embed.js'
+
+    // here we will only load the disqus <script> if not already loaded
+    if (!window.DISQUS) {
+      (function(d,s) {
+      s = d.createElement('script');s.async=1;s.src = '//' + disqus_shortname + '.disqus.com/'+disqus_script;
+      (d.getElementsByTagName('head')[0]).appendChild(s);
+      })(document)
+    }
+    // if disqus <script> is already loaded, we just reset disqus the right way
+    // see https://help.disqus.com/developer/using-disqus-on-ajax-sites
+    else {
+      DISQUS.reset({
+        reload: true,
+        config: function () {
+          this.page.identifier = disqus_identifier
+          this.page.url = disqus_url
+        }
+      })
+    }
+  </script>
+<!-- } -->
+</div>
+```
+
+**Note: Pjax only handles inline `<script>` blocks for the container you are switching.**
+
+## Examples
+
+Clone this repository and run `npm run example`, which will open the example app in your browser.
+
+## CONTRIBUTING
+
+- ⇄ Pull requests and ★ Stars are always welcome.
+- For bugs and feature requests, please create an issue.
+- Pull requests must be accompanied by passing automated tests (`npm test`). If the API is changed, please update the Typescript definitions as well (`pjax.d.ts`).
+
+## [CHANGELOG](CHANGELOG.md)
+
+## [LICENSE](LICENSE)
diff --git a/example/example.js b/example/example.js
new file mode 100644
index 0000000..7551df3
--- /dev/null
+++ b/example/example.js
@@ -0,0 +1,59 @@
+/* global Pjax */
+var pjax;
+var initButtons = function() {
+  var buttons = document.querySelectorAll("button[data-manual-trigger]");
+
+  if (!buttons) {
+    return;
+  }
+
+  // jshint -W083
+  for (var i = 0; i < buttons.length; i++) {
+    buttons[i].addEventListener("click", function(e) {
+      var el = e.currentTarget;
+
+      if (el.getAttribute("data-manual-trigger-override") === "true") {
+        // Manually load URL with overridden Pjax instance options
+        pjax.loadUrl("/example/page2.html", { cacheBust: false });
+      } else {
+        // Manually load URL with current Pjax instance options
+        pjax.loadUrl("/example/page2.html");
+      }
+    });
+  }
+  // jshint +W083
+};
+
+console.log("Document initialized:", window.location.href);
+
+document.addEventListener("pjax:send", function() {
+  console.log("Event: pjax:send", arguments);
+});
+
+document.addEventListener("pjax:complete", function() {
+  console.log("Event: pjax:complete", arguments);
+});
+
+document.addEventListener("pjax:error", function() {
+  console.log("Event: pjax:error", arguments);
+});
+
+document.addEventListener("pjax:success", function() {
+  console.log("Event: pjax:success", arguments);
+
+  // Init page content
+  initButtons();
+});
+
+document.addEventListener("DOMContentLoaded", function() {
+  // Init Pjax instance
+  pjax = new Pjax({
+    elements: [".js-Pjax"],
+    selectors: [".body", "title"],
+    cacheBust: true
+  });
+  console.log("Pjax initialized.", pjax);
+
+  // Init page content
+  initButtons();
+});
diff --git a/example/forms.html b/example/forms.html
new file mode 100644
index 0000000..df15742
--- /dev/null
+++ b/example/forms.html
@@ -0,0 +1,138 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Forms</title>
+    <script src="../pjax.js"></script>
+    <script src="example.js"></script>
+  </head>
+  <body>
+    <div class="body">
+      <h1>Forms</h1>
+      Hello. Try out the examples below and inspect the results in your browser's developer tools, or go to the <a href="index.html" class="js-Pjax">Index</a>.
+
+      <h3>GET form</h3>
+
+      <form action="" method="get" class="js-Pjax" id="get-form">
+        <label for="get-form-text">Text input:</label>
+        <input type="text" name="textInput" id="get-form-text" value="Foobar" />
+
+        <br />
+        <br />
+
+        <label for="get-form-number">Number input:</label>
+        <input type="number" name="numberInput" id="get-form-number" value="1" />
+
+        <br />
+        <br />
+
+        <label for="get-form-email">Email input:</label>
+        <input type="email" name="emailInput" id="get-form-email" value="example@example.com" />
+
+        <br />
+        <br />
+
+        <label for="get-form-textarea">Textarea:</label>
+        <textarea name="textarea" id="get-form-textarea">This is some text</textarea>
+
+        <br />
+        <br />
+
+        <fieldset>
+          <label for="get-form-radio-1">Radio input:</label>
+          <input type="radio" name="radioInput" value="radio-1" checked id="get-form-radio-1" />
+
+          <label for="get-form-radio-2">Radio input alt:</label>
+          <input type="radio" name="radioInput" value="radio-2" id="get-form-radio-2" />
+        </fieldset>
+
+        <br />
+        <br />
+
+        <label for="get-form-checkbox">Checkbox input:</label>
+        <input type="checkbox" name="checkboxInput" checked id="get-form-checkbox" />
+
+        <br />
+        <br />
+
+        <label for="get-form-select">Select list:</label>
+        <select multiple name="select" id="get-form-select">
+          <option>
+            Option 1
+          </option>
+          <option>
+            Option 2
+          </option>
+        </select>
+
+        <br />
+        <br />
+
+        <input type="submit" value="Submit" />
+      </form>
+
+      <br />
+      <br />
+
+      <h3>POST form</h3>
+
+      <form action="" method="post" class="js-Pjax" id="post-form">
+        <label for="post-form-text">Text input:</label>
+        <input type="text" name="textInput" id="post-form-text" value="Foobar" />
+
+        <br />
+        <br />
+
+        <label for="post-form-number">Number input:</label>
+        <input type="number" name="numberInput" id="post-form-number" value="1" />
+
+        <br />
+        <br />
+
+        <label for="post-form-email">Email input:</label>
+        <input type="email" name="emailInput" id="post-form-email" value="example@example.com" />
+
+        <br />
+        <br />
+
+        <label for="post-form-textarea">Textarea:</label>
+        <textarea name="textarea" id="post-form-textarea">This is some text</textarea>
+
+        <br />
+        <br />
+
+        <fieldset>
+          <label for="post-form-radio-1">Radio input:</label>
+          <input type="radio" name="radioInput" value="radio-1" checked id="post-form-radio-1" />
+
+          <label for="post-form-radio-2">Radio input alt:</label>
+          <input type="radio" name="radioInput" value="radio-2" id="post-form-radio-2" />
+        </fieldset>
+
+        <br />
+        <br />
+
+        <label for="post-form-checkbox">Checkbox input:</label>
+        <input type="checkbox" name="checkboxInput" checked id="post-form-checkbox" />
+
+        <br />
+        <br />
+
+        <label for="post-form-select">Select list:</label>
+        <select multiple name="select" id="post-form-select">
+          <option>
+            Option 1
+          </option>
+          <option>
+            Option 2
+          </option>
+        </select>
+
+        <br />
+        <br />
+
+        <input type="submit" value="Submit" />
+      </form>
+    </div>
+  </body>
+</html>
diff --git a/example/index.html b/example/index.html
new file mode 100644
index 0000000..f22b1ec
--- /dev/null
+++ b/example/index.html
@@ -0,0 +1,29 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Hello</title>
+    <script src="../pjax.js"></script>
+    <script src="example.js"></script>
+  </head>
+  <body>
+    <div class="body">
+      <h1>Index</h1>
+      Hello.
+      Go to <a href="page2.html" class="js-Pjax">Page 2</a> or <a href="page3.html" class="js-Pjax">Page 3</a> and view your console to see Pjax events.
+      Clicking on <a href="index.html">this page</a> will do nothing.
+
+      <h2>Manual URL loading</h2>
+
+      You can use Pjax's <i>loadUrl</i> method to manually load a URL. Click the buttons below to try it out!<br /><br />
+
+      <button data-manual-trigger>loadUrl with current options</button><br /><br />
+      <button data-manual-trigger data-manual-trigger-override="true">loadUrl with overridden options (no cache busting)</button>
+
+      <h2>Forms</h2>
+
+      You can submit GET or POST forms with Pjax! Go to the <a href="forms.html">form examples</a> to try it out.
+
+    </div>
+  </body>
+</html>
diff --git a/example/page2.html b/example/page2.html
new file mode 100644
index 0000000..7d0b941
--- /dev/null
+++ b/example/page2.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Page 2</title>
+    <script src="../pjax.js"></script>
+    <script src="example.js"></script>
+  </head>
+  <body>
+    <div class="body">
+      <h1>Page 2</h1>
+      Hello. Go to <a href="index.html" class="js-Pjax">Index</a>.
+    </div>
+  </body>
+</html>
diff --git a/example/page3.html b/example/page3.html
new file mode 100644
index 0000000..9864eb6
--- /dev/null
+++ b/example/page3.html
@@ -0,0 +1,15 @@
+<!doctype html>
+<html>
+  <head>
+    <meta charset="utf-8">
+    <title>Page 3</title>
+    <script src="../pjax.js"></script>
+    <script src="example.js"></script>
+  </head>
+  <body>
+    <div class="body">
+      <h1>Page 3</h1>
+      Hello. Go to <a href="index.html" class="js-Pjax">Index</a>.
+    </div>
+  </body>
+</html>
diff --git a/index.d.ts b/index.d.ts
new file mode 100644
index 0000000..1e78099
--- /dev/null
+++ b/index.d.ts
@@ -0,0 +1,205 @@
+declare class Pjax {
+  options: Pjax.IOptions;
+
+  constructor(options?: Partial<Pjax.IOptions>);
+
+  static switches: {
+    [key in DefaultSwitches]: Pjax.Switch
+  };
+
+  /**
+   * Checks if Pjax is supported by the environment.
+   */
+  static isSupported: () => boolean;
+
+  log: VoidFunction;
+
+  getElements(el: Element | Document): NodeListOf<Element>;
+
+  parseDOM(el: Element | Document): void;
+
+  refresh: ElementFunction;
+
+  reload: VoidFunction;
+
+  attachLink(el: HTMLAnchorElement): void;
+
+  attachForm(el: HTMLFormElement): void;
+
+  forEachSelectors(cb: ElementFunction, context: Pjax, DOMcontext?: Element | Document): void;
+
+  switchesSelectors(selectors: string[], fromEl: Element | Document, toEl: Element | Document, options: Pjax.IOptions): void;
+
+  latestChance(href: string): void;
+
+  onSwitch: VoidFunction;
+
+  /**
+   * Loads the HTML from the response into the DOM.
+   *
+   * @param {string} html
+   * @param {Pjax.IOptions} options
+   */
+  loadContent(html: string, options: Pjax.IOptions): void;
+
+  /**
+   * Aborts an ongoing XHR request.
+   *
+   * @param {XMLHttpRequest} request
+   */
+  abortRequest(request: XMLHttpRequest): void;
+
+  /**
+   * Makes the XHR request.
+   *
+   * @param {string} location The URI for the request.
+   * @param {Pjax.IOptions | null} options
+   * @param {(requestText: string, request: XMLHttpRequest, href: string) => void} callback The callback to call when
+   * the response is received. The signature should match that of <code>handleResponse</code>.
+   * @returns {XMLHttpRequest}
+   */
+  doRequest(location: string, options: Pjax.IOptions | null,
+            callback: (requestText: string, request: XMLHttpRequest, href: string) => void): XMLHttpRequest;
+
+  /**
+   * Saves the state, updates the URL if there were any redirects, then calls loadContent().
+   *
+   * @param {string} requestText The raw text of the response. Same as <code>request.responseText</code>.
+   * @param {XMLHttpRequest} request The XHR object.
+   * @param {string} href The original URI used to initiate the request.
+   * @param options The Pjax options object used for the request
+   */
+  handleResponse(requestText: string, request: XMLHttpRequest, href: string, options?: Pjax.IOptions): void;
+
+  /**
+   * Initiates the request by calling <code>doRequest()</code>.
+   * @param {string} href
+   * @param {Pjax.IOptions} options
+   */
+  loadUrl(href: string, options?: Pjax.IOptions): void;
+
+  /**
+   * Called after all switches complete (even async).
+   */
+  afterAllSwitches: VoidFunction;
+
+  /**
+   * Allows reassignment of existing prototype functions to be able to do something before calling the original function.
+   * For example:
+   *
+   * <pre>
+   *   pjax._handleResponse = pjax.handleResponse;
+   *   pjax.handleResponse = (requestText: string, request: XMLHttpRequest, href: string) => {
+   *     return pjax._handleResponse(requestText, request, href);
+   *   }
+   * </pre>
+   */
+  [key: string]: Function | Pjax.IOptions;
+}
+
+declare namespace Pjax {
+  export interface IOptions {
+    /**
+     * CSS selector to use to retrieve links to apply Pjax to.
+     */
+    elements: string;
+
+    /**
+     * CSS selectors for the elements to replace.
+     */
+    selectors: string[];
+
+    /**
+     * Objects containing callbacks that can be used to switch old elements with new elements.
+     * Keys should be one of the defined selectors.
+     */
+    switches: StringKeyedObject<Switch>;
+
+    /**
+     * These are options that can be used during switches.
+     * Keys should be one of the defined selectors.
+     */
+    switchesOptions: StringKeyedObject;
+
+    /**
+     * Enable the use of pushState(). Disabling this will prevent Pjax from updating browser history.
+     * Internally, this option is used when a popstate event triggers Pjax (to not pushState() again).
+     */
+    history: boolean;
+
+    /**
+     * Function that allows you to add behavior for analytics.
+     * By default it tries to track a pageview with Google Analytics (if it exists on the page).
+     * It's called every time a page is switched, even for history navigation.
+     * Set to false to disable this behavior.
+     */
+    analytics: Function | false;
+
+    /**
+     * When set to an integer, this is the value (in px from the top of the page) to scroll to when a page is switched.
+     * When set to an array of 2 integers ([x, y]), this is the value to scroll both horizontally and vertically.
+     * Set this to false to disable scrolling, which will mean the page will stay in that same position it was before
+     * loading the new elements.
+     */
+    scrollTo: number | [number, number] | false;
+
+    /**
+     * When set to true, attempt to restore the scroll position when navigating backwards or forwards.
+     */
+    scrollRestoration: boolean;
+
+    /**
+     * When set to true, append a timestamp query string segment to the requested URLs in order to skip browser cache.
+     */
+    cacheBust: boolean;
+
+    /**
+     * Enables verbose mode.
+     */
+    debug: boolean;
+
+    /**
+     * The timeout in milliseconds for the XHR requests. Set to 0 to disable the timeout.
+     */
+    timeout: number;
+
+    /**
+     * When set to true, clicking on a link that points to the current URL will trigger a full page reload.
+     * (Note that if cacheBust is set to true, the code that checks if the href is the same as the current page's URL
+     * will not work, due to the query string appended to force a cache bust).
+     */
+    currentUrlFullReload: boolean;
+
+    /**
+     * Hold the information to make an XHR request.
+     */
+    requestOptions?: {
+      requestUrl?: string;
+      requestMethod?: string;
+      requestParams?: IRequestParams[];
+      formData?: FormData;
+    }
+  }
+
+  export type Switch = (oldEl: Element, newEl: Element, options?: IOptions, switchesOptions?: StringKeyedObject) => void;
+
+  export interface IRequestParams {
+    name: string,
+    value: string
+  }
+}
+
+interface StringKeyedObject<T = any> {
+  [key: string]: T
+}
+
+type ElementFunction = (el: Element) => void;
+
+declare enum DefaultSwitches {
+  innerHTML = "innerHTML",
+  ouetrHTML = "outerHTML",
+  sideBySide = "sideBySide",
+  replaceNode = "replaceNode"
+}
+
+export = Pjax;
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..b528d85
--- /dev/null
+++ b/index.js
@@ -0,0 +1,318 @@
+var executeScripts = require("./lib/execute-scripts");
+var forEachEls = require("./lib/foreach-els");
+var parseOptions = require("./lib/parse-options");
+var switches = require("./lib/switches");
+var newUid = require("./lib/uniqueid");
+
+var on = require("./lib/events/on");
+var trigger = require("./lib/events/trigger");
+
+var clone = require("./lib/util/clone");
+var contains = require("./lib/util/contains");
+var extend = require("./lib/util/extend");
+var noop = require("./lib/util/noop");
+
+var Pjax = function(options) {
+  this.state = {
+    numPendingSwitches: 0,
+    href: null,
+    options: null
+  };
+
+  this.options = parseOptions(options);
+  this.log("Pjax options", this.options);
+
+  if (this.options.scrollRestoration && "scrollRestoration" in history) {
+    history.scrollRestoration = "manual";
+  }
+
+  this.maxUid = this.lastUid = newUid();
+
+  this.parseDOM(document);
+
+  on(
+    window,
+    "popstate",
+    function(st) {
+      if (st.state) {
+        var opt = clone(this.options);
+        opt.url = st.state.url;
+        opt.title = st.state.title;
+        // Since state already exists, prevent it from being pushed again
+        opt.history = false;
+        opt.scrollPos = st.state.scrollPos;
+        if (st.state.uid < this.lastUid) {
+          opt.backward = true;
+        } else {
+          opt.forward = true;
+        }
+        this.lastUid = st.state.uid;
+
+        // @todo implement history cache here, based on uid
+        this.loadUrl(st.state.url, opt);
+      }
+    }.bind(this)
+  );
+};
+
+Pjax.switches = switches;
+
+Pjax.prototype = {
+  log: require("./lib/proto/log"),
+
+  getElements: function(el) {
+    return el.querySelectorAll(this.options.elements);
+  },
+
+  parseDOM: function(el) {
+    var parseElement = require("./lib/proto/parse-element");
+    forEachEls(this.getElements(el), parseElement, this);
+  },
+
+  refresh: function(el) {
+    this.parseDOM(el || document);
+  },
+
+  reload: function() {
+    window.location.reload();
+  },
+
+  attachLink: require("./lib/proto/attach-link"),
+
+  attachForm: require("./lib/proto/attach-form"),
+
+  forEachSelectors: function(cb, context, DOMcontext) {
+    return require("./lib/foreach-selectors").bind(this)(
+      this.options.selectors,
+      cb,
+      context,
+      DOMcontext
+    );
+  },
+
+  switchSelectors: function(selectors, fromEl, toEl, options) {
+    return require("./lib/switches-selectors").bind(this)(
+      this.options.switches,
+      this.options.switchesOptions,
+      selectors,
+      fromEl,
+      toEl,
+      options
+    );
+  },
+
+  latestChance: function(href) {
+    window.location = href;
+  },
+
+  onSwitch: function() {
+    trigger(window, "resize scroll");
+
+    this.state.numPendingSwitches--;
+
+    // debounce calls, so we only run this once after all switches are finished.
+    if (this.state.numPendingSwitches === 0) {
+      this.afterAllSwitches();
+    }
+  },
+
+  loadContent: function(html, options) {
+    if (typeof html !== "string") {
+      trigger(document, "pjax:complete pjax:error", options);
+
+      return;
+    }
+
+    var tmpEl = document.implementation.createHTMLDocument("pjax");
+
+    // parse HTML attributes to copy them
+    // since we are forced to use documentElement.innerHTML (outerHTML can't be used for <html>)
+    var htmlRegex = /<html[^>]+>/gi;
+    var htmlAttribsRegex = /\s?[a-z:]+(?:=['"][^'">]+['"])*/gi;
+    var matches = html.match(htmlRegex);
+    if (matches && matches.length) {
+      matches = matches[0].match(htmlAttribsRegex);
+      if (matches.length) {
+        matches.shift();
+        matches.forEach(function(htmlAttrib) {
+          var attr = htmlAttrib.trim().split("=");
+          if (attr.length === 1) {
+            tmpEl.documentElement.setAttribute(attr[0], true);
+          } else {
+            tmpEl.documentElement.setAttribute(attr[0], attr[1].slice(1, -1));
+          }
+        });
+      }
+    }
+
+    tmpEl.documentElement.innerHTML = html;
+    this.log(
+      "load content",
+      tmpEl.documentElement.attributes,
+      tmpEl.documentElement.innerHTML.length
+    );
+
+    // Clear out any focused controls before inserting new page contents.
+    if (
+      document.activeElement &&
+      contains(document, this.options.selectors, document.activeElement)
+    ) {
+      try {
+        document.activeElement.blur();
+      } catch (e) {} // eslint-disable-line no-empty
+    }
+
+    this.switchSelectors(this.options.selectors, tmpEl, document, options);
+  },
+
+  abortRequest: require("./lib/abort-request"),
+
+  doRequest: require("./lib/send-request"),
+
+  handleResponse: require("./lib/proto/handle-response"),
+
+  loadUrl: function(href, options) {
+    options =
+      typeof options === "object"
+        ? extend({}, this.options, options)
+        : clone(this.options);
+
+    this.log("load href", href, options);
+
+    // Abort any previous request
+    this.abortRequest(this.request);
+
+    trigger(document, "pjax:send", options);
+
+    // Do the request
+    this.request = this.doRequest(
+      href,
+      options,
+      this.handleResponse.bind(this)
+    );
+  },
+
+  afterAllSwitches: function() {
+    // FF bug: Won’t autofocus fields that are inserted via JS.
+    // This behavior is incorrect. So if theres no current focus, autofocus
+    // the last field.
+    //
+    // http://www.w3.org/html/wg/drafts/html/master/forms.html
+    var autofocusEl = Array.prototype.slice
+      .call(document.querySelectorAll("[autofocus]"))
+      .pop();
+    if (autofocusEl && document.activeElement !== autofocusEl) {
+      autofocusEl.focus();
+    }
+
+    // execute scripts when DOM have been completely updated
+    this.options.selectors.forEach(function(selector) {
+      forEachEls(document.querySelectorAll(selector), function(el) {
+        executeScripts(el);
+      });
+    });
+
+    var state = this.state;
+
+    if (state.options.history) {
+      if (!window.history.state) {
+        this.lastUid = this.maxUid = newUid();
+        window.history.replaceState(
+          {
+            url: window.location.href,
+            title: document.title,
+            uid: this.maxUid,
+            scrollPos: [0, 0]
+          },
+          document.title
+        );
+      }
+
+      // Update browser history
+      this.lastUid = this.maxUid = newUid();
+
+      window.history.pushState(
+        {
+          url: state.href,
+          title: state.options.title,
+          uid: this.maxUid,
+          scrollPos: [0, 0]
+        },
+        state.options.title,
+        state.href
+      );
+    }
+
+    this.forEachSelectors(function(el) {
+      this.parseDOM(el);
+    }, this);
+
+    // Fire Events
+    trigger(document, "pjax:complete pjax:success", state.options);
+
+    if (typeof state.options.analytics === "function") {
+      state.options.analytics();
+    }
+
+    if (state.options.history) {
+      // First parse url and check for hash to override scroll
+      var a = document.createElement("a");
+      a.href = this.state.href;
+      if (a.hash) {
+        var name = a.hash.slice(1);
+        name = decodeURIComponent(name);
+
+        var curtop = 0;
+        var target =
+          document.getElementById(name) || document.getElementsByName(name)[0];
+        if (target) {
+          // http://stackoverflow.com/questions/8111094/cross-browser-javascript-function-to-find-actual-position-of-an-element-in-page
+          if (target.offsetParent) {
+            do {
+              curtop += target.offsetTop;
+
+              target = target.offsetParent;
+            } while (target);
+          }
+        }
+        window.scrollTo(0, curtop);
+      } else if (state.options.scrollTo !== false) {
+        // Scroll page to top on new page load
+        if (state.options.scrollTo.length > 1) {
+          window.scrollTo(state.options.scrollTo[0], state.options.scrollTo[1]);
+        } else {
+          window.scrollTo(0, state.options.scrollTo);
+        }
+      }
+    } else if (state.options.scrollRestoration && state.options.scrollPos) {
+      window.scrollTo(state.options.scrollPos[0], state.options.scrollPos[1]);
+    }
+
+    this.state = {
+      numPendingSwitches: 0,
+      href: null,
+      options: null
+    };
+  }
+};
+
+Pjax.isSupported = require("./lib/is-supported");
+
+// arguably could do `if( require("./lib/is-supported")()) {` but that might be a little to simple
+if (Pjax.isSupported()) {
+  module.exports = Pjax;
+}
+// if there isn’t required browser functions, returning stupid api
+else {
+  var stupidPjax = noop;
+  for (var key in Pjax.prototype) {
+    if (
+      Pjax.prototype.hasOwnProperty(key) &&
+      typeof Pjax.prototype[key] === "function"
+    ) {
+      stupidPjax[key] = noop;
+    }
+  }
+
+  module.exports = stupidPjax;
+}
diff --git a/lib/abort-request.js b/lib/abort-request.js
new file mode 100644
index 0000000..5166bd9
--- /dev/null
+++ b/lib/abort-request.js
@@ -0,0 +1,8 @@
+var noop = require("./util/noop");
+
+module.exports = function(request) {
+  if (request && request.readyState < 4) {
+    request.onreadystatechange = noop;
+    request.abort();
+  }
+};
diff --git a/lib/eval-script.js b/lib/eval-script.js
new file mode 100644
index 0000000..bf8cd29
--- /dev/null
+++ b/lib/eval-script.js
@@ -0,0 +1,48 @@
+module.exports = function(el) {
+  var code = el.text || el.textContent || el.innerHTML || "";
+  var src = el.src || "";
+  var parent =
+    el.parentNode || document.querySelector("head") || document.documentElement;
+  var script = document.createElement("script");
+
+  if (code.match("document.write")) {
+    if (console && console.log) {
+      console.log(
+        "Script contains document.write. Can’t be executed correctly. Code skipped ",
+        el
+      );
+    }
+    return false;
+  }
+
+  script.type = "text/javascript";
+  script.id = el.id;
+
+  /* istanbul ignore if */
+  if (src !== "") {
+    script.src = src;
+    script.async = false; // force synchronous loading of peripheral JS
+  }
+
+  if (code !== "") {
+    try {
+      script.appendChild(document.createTextNode(code));
+    } catch (e) {
+      /* istanbul ignore next */
+      // old IEs have funky script nodes
+      script.text = code;
+    }
+  }
+
+  // execute
+  parent.appendChild(script);
+  // avoid pollution only in head or body tags
+  if (
+    (parent instanceof HTMLHeadElement || parent instanceof HTMLBodyElement) &&
+    parent.contains(script)
+  ) {
+    parent.removeChild(script);
+  }
+
+  return true;
+};
diff --git a/lib/events/off.js b/lib/events/off.js
new file mode 100644
index 0000000..29f54cf
--- /dev/null
+++ b/lib/events/off.js
@@ -0,0 +1,11 @@
+var forEachEls = require("../foreach-els");
+
+module.exports = function(els, events, listener, useCapture) {
+  events = typeof events === "string" ? events.split(" ") : events;
+
+  events.forEach(function(e) {
+    forEachEls(els, function(el) {
+      el.removeEventListener(e, listener, useCapture);
+    });
+  });
+};
diff --git a/lib/events/on.js b/lib/events/on.js
new file mode 100644
index 0000000..02b243b
--- /dev/null
+++ b/lib/events/on.js
@@ -0,0 +1,11 @@
+var forEachEls = require("../foreach-els");
+
+module.exports = function(els, events, listener, useCapture) {
+  events = typeof events === "string" ? events.split(" ") : events;
+
+  events.forEach(function(e) {
+    forEachEls(els, function(el) {
+      el.addEventListener(e, listener, useCapture);
+    });
+  });
+};
diff --git a/lib/events/trigger.js b/lib/events/trigger.js
new file mode 100644
index 0000000..96ae7f6
--- /dev/null
+++ b/lib/events/trigger.js
@@ -0,0 +1,31 @@
+var forEachEls = require("../foreach-els");
+
+module.exports = function(els, events, opts) {
+  events = typeof events === "string" ? events.split(" ") : events;
+
+  events.forEach(function(e) {
+    var event;
+    event = document.createEvent("HTMLEvents");
+    event.initEvent(e, true, true);
+    event.eventName = e;
+    if (opts) {
+      Object.keys(opts).forEach(function(key) {
+        event[key] = opts[key];
+      });
+    }
+
+    forEachEls(els, function(el) {
+      var domFix = false;
+      if (!el.parentNode && el !== document && el !== window) {
+        // THANK YOU IE (9/10/11)
+        // dispatchEvent doesn't work if the element is not in the DOM
+        domFix = true;
+        document.body.appendChild(el);
+      }
+      el.dispatchEvent(event);
+      if (domFix) {
+        el.parentNode.removeChild(el);
+      }
+    });
+  });
+};
diff --git a/lib/execute-scripts.js b/lib/execute-scripts.js
new file mode 100644
index 0000000..9436af3
--- /dev/null
+++ b/lib/execute-scripts.js
@@ -0,0 +1,18 @@
+var forEachEls = require("./foreach-els");
+var evalScript = require("./eval-script");
+// Finds and executes scripts (used for newly added elements)
+// Needed since innerHTML does not run scripts
+module.exports = function(el) {
+  if (el.tagName.toLowerCase() === "script") {
+    evalScript(el);
+  }
+
+  forEachEls(el.querySelectorAll("script"), function(script) {
+    if (!script.type || script.type.toLowerCase() === "text/javascript") {
+      if (script.parentNode) {
+        script.parentNode.removeChild(script);
+      }
+      evalScript(script);
+    }
+  });
+};
diff --git a/lib/foreach-els.js b/lib/foreach-els.js
new file mode 100644
index 0000000..f4bd07d
--- /dev/null
+++ b/lib/foreach-els.js
@@ -0,0 +1,13 @@
+/* global HTMLCollection: true */
+
+module.exports = function(els, fn, context) {
+  if (
+    els instanceof HTMLCollection ||
+    els instanceof NodeList ||
+    els instanceof Array
+  ) {
+    return Array.prototype.forEach.call(els, fn, context);
+  }
+  // assume simple DOM element
+  return fn.call(context, els);
+};
diff --git a/lib/foreach-selectors.js b/lib/foreach-selectors.js
new file mode 100644
index 0000000..fd57099
--- /dev/null
+++ b/lib/foreach-selectors.js
@@ -0,0 +1,8 @@
+var forEachEls = require("./foreach-els");
+
+module.exports = function(selectors, cb, context, DOMcontext) {
+  DOMcontext = DOMcontext || document;
+  selectors.forEach(function(selector) {
+    forEachEls(DOMcontext.querySelectorAll(selector), cb, context);
+  });
+};
diff --git a/lib/is-supported.js b/lib/is-supported.js
new file mode 100644
index 0000000..5bf862b
--- /dev/null
+++ b/lib/is-supported.js
@@ -0,0 +1,12 @@
+module.exports = function() {
+  // Borrowed wholesale from https://github.com/defunkt/jquery-pjax
+  return (
+    window.history &&
+    window.history.pushState &&
+    window.history.replaceState &&
+    // pushState isn’t reliable on iOS until 5.
+    !navigator.userAgent.match(
+      /((iPod|iPhone|iPad).+\bOS\s+[1-4]\D|WebApps\/.+CFNetwork)/
+    )
+  );
+};
diff --git a/lib/parse-options.js b/lib/parse-options.js
new file mode 100644
index 0000000..414b72e
--- /dev/null
+++ b/lib/parse-options.js
@@ -0,0 +1,53 @@
+/* global _gaq: true, ga: true */
+
+var defaultSwitches = require("./switches");
+
+module.exports = function(options) {
+  options = options || {};
+  options.elements = options.elements || "a[href], form[action]";
+  options.selectors = options.selectors || ["title", ".js-Pjax"];
+  options.switches = options.switches || {};
+  options.switchesOptions = options.switchesOptions || {};
+  options.history =
+    typeof options.history === "undefined" ? true : options.history;
+  options.analytics =
+    typeof options.analytics === "function" || options.analytics === false
+      ? options.analytics
+      : defaultAnalytics;
+  options.scrollTo =
+    typeof options.scrollTo === "undefined" ? 0 : options.scrollTo;
+  options.scrollRestoration =
+    typeof options.scrollRestoration !== "undefined"
+      ? options.scrollRestoration
+      : true;
+  options.cacheBust =
+    typeof options.cacheBust === "undefined" ? true : options.cacheBust;
+  options.debug = options.debug || false;
+  options.timeout = options.timeout || 0;
+  options.currentUrlFullReload =
+    typeof options.currentUrlFullReload === "undefined"
+      ? false
+      : options.currentUrlFullReload;
+
+  // We can’t replace body.outerHTML or head.outerHTML.
+  // It creates a bug where a new body or head are created in the DOM.
+  // If you set head.outerHTML, a new body tag is appended, so the DOM has 2 body nodes, and vice versa
+  if (!options.switches.head) {
+    options.switches.head = defaultSwitches.switchElementsAlt;
+  }
+  if (!options.switches.body) {
+    options.switches.body = defaultSwitches.switchElementsAlt;
+  }
+
+  return options;
+};
+
+/* istanbul ignore next */
+function defaultAnalytics() {
+  if (window._gaq) {
+    _gaq.push(["_trackPageview"]);
+  }
+  if (window.ga) {
+    ga("send", "pageview", { page: location.pathname, title: document.title });
+  }
+}
diff --git a/lib/proto/attach-form.js b/lib/proto/attach-form.js
new file mode 100644
index 0000000..74e2c26
--- /dev/null
+++ b/lib/proto/attach-form.js
@@ -0,0 +1,139 @@
+var on = require("../events/on");
+var clone = require("../util/clone");
+
+var attrState = "data-pjax-state";
+
+var formAction = function(el, event) {
+  if (isDefaultPrevented(event)) {
+    return;
+  }
+
+  // Since loadUrl modifies options and we may add our own modifications below,
+  // clone it so the changes don't persist
+  var options = clone(this.options);
+
+  // Initialize requestOptions
+  options.requestOptions = {
+    requestUrl: el.getAttribute("action") || window.location.href,
+    requestMethod: el.getAttribute("method") || "GET"
+  };
+
+  // create a testable virtual link of the form action
+  var virtLinkElement = document.createElement("a");
+  virtLinkElement.setAttribute("href", options.requestOptions.requestUrl);
+
+  var attrValue = checkIfShouldAbort(virtLinkElement, options);
+  if (attrValue) {
+    el.setAttribute(attrState, attrValue);
+    return;
+  }
+
+  event.preventDefault();
+
+  if (el.enctype === "multipart/form-data") {
+    options.requestOptions.formData = new FormData(el);
+  } else {
+    options.requestOptions.requestParams = parseFormElements(el);
+  }
+
+  el.setAttribute(attrState, "submit");
+
+  options.triggerElement = el;
+  this.loadUrl(virtLinkElement.href, options);
+};
+
+function parseFormElements(el) {
+  var requestParams = [];
+  var formElements = el.elements;
+
+  for (var i = 0; i < formElements.length; i++) {
+    var element = formElements[i];
+    var tagName = element.tagName.toLowerCase();
+    // jscs:disable disallowImplicitTypeConversion
+    if (
+      !!element.name &&
+      element.attributes !== undefined &&
+      tagName !== "button"
+    ) {
+      // jscs:enable disallowImplicitTypeConversion
+      var type = element.attributes.type;
+
+      if (
+        !type ||
+        (type.value !== "checkbox" && type.value !== "radio") ||
+        element.checked
+      ) {
+        // Build array of values to submit
+        var values = [];
+
+        if (tagName === "select") {
+          var opt;
+
+          for (var j = 0; j < element.options.length; j++) {
+            opt = element.options[j];
+            if (opt.selected && !opt.disabled) {
+              values.push(opt.hasAttribute("value") ? opt.value : opt.text);
+            }
+          }
+        } else {
+          values.push(element.value);
+        }
+
+        for (var k = 0; k < values.length; k++) {
+          requestParams.push({
+            name: encodeURIComponent(element.name),
+            value: encodeURIComponent(values[k])
+          });
+        }
+      }
+    }
+  }
+
+  return requestParams;
+}
+
+function checkIfShouldAbort(virtLinkElement, options) {
+  // Ignore external links.
+  if (
+    virtLinkElement.protocol !== window.location.protocol ||
+    virtLinkElement.host !== window.location.host
+  ) {
+    return "external";
+  }
+
+  // Ignore click if we are on an anchor on the same page
+  if (
+    virtLinkElement.hash &&
+    virtLinkElement.href.replace(virtLinkElement.hash, "") ===
+      window.location.href.replace(location.hash, "")
+  ) {
+    return "anchor";
+  }
+
+  // Ignore empty anchor "foo.html#"
+  if (virtLinkElement.href === window.location.href.split("#")[0] + "#") {
+    return "anchor-empty";
+  }
+
+  // if declared as a full reload, just normally submit the form
+  if (
+    options.currentUrlFullReload &&
+    virtLinkElement.href === window.location.href.split("#")[0]
+  ) {
+    return "reload";
+  }
+}
+
+var isDefaultPrevented = function(event) {
+  return event.defaultPrevented || event.returnValue === false;
+};
+
+module.exports = function(el) {
+  var that = this;
+
+  el.setAttribute(attrState, "");
+
+  on(el, "submit", function(event) {
+    formAction.call(that, el, event);
+  });
+};
diff --git a/lib/proto/attach-link.js b/lib/proto/attach-link.js
new file mode 100644
index 0000000..b990ffb
--- /dev/null
+++ b/lib/proto/attach-link.js
@@ -0,0 +1,99 @@
+var on = require("../events/on");
+var clone = require("../util/clone");
+
+var attrState = "data-pjax-state";
+
+var linkAction = function(el, event) {
+  if (isDefaultPrevented(event)) {
+    return;
+  }
+
+  // Since loadUrl modifies options and we may add our own modifications below,
+  // clone it so the changes don't persist
+  var options = clone(this.options);
+
+  var attrValue = checkIfShouldAbort(el, event);
+  if (attrValue) {
+    el.setAttribute(attrState, attrValue);
+    return;
+  }
+
+  event.preventDefault();
+
+  // don’t do "nothing" if user try to reload the page by clicking the same link twice
+  if (
+    this.options.currentUrlFullReload &&
+    el.href === window.location.href.split("#")[0]
+  ) {
+    el.setAttribute(attrState, "reload");
+    this.reload();
+    return;
+  }
+
+  el.setAttribute(attrState, "load");
+
+  options.triggerElement = el;
+  this.loadUrl(el.href, options);
+};
+
+function checkIfShouldAbort(el, event) {
+  // Don’t break browser special behavior on links (like page in new window)
+  if (
+    event.which > 1 ||
+    event.metaKey ||
+    event.ctrlKey ||
+    event.shiftKey ||
+    event.altKey
+  ) {
+    return "modifier";
+  }
+
+  // we do test on href now to prevent unexpected behavior if for some reason
+  // user have href that can be dynamically updated
+
+  // Ignore external links.
+  if (
+    el.protocol !== window.location.protocol ||
+    el.host !== window.location.host
+  ) {
+    return "external";
+  }
+
+  // Ignore anchors on the same page (keep native behavior)
+  if (
+    el.hash &&
+    el.href.replace(el.hash, "") ===
+      window.location.href.replace(location.hash, "")
+  ) {
+    return "anchor";
+  }
+
+  // Ignore empty anchor "foo.html#"
+  if (el.href === window.location.href.split("#")[0] + "#") {
+    return "anchor-empty";
+  }
+}
+
+var isDefaultPrevented = function(event) {
+  return event.defaultPrevented || event.returnValue === false;
+};
+
+module.exports = function(el) {
+  var that = this;
+
+  el.setAttribute(attrState, "");
+
+  on(el, "click", function(event) {
+    linkAction.call(that, el, event);
+  });
+
+  on(
+    el,
+    "keyup",
+    function(event) {
+      if (event.keyCode === 13) {
+        linkAction.call(that, el, event);
+      }
+    }.bind(this)
+  );
+};
diff --git a/lib/proto/handle-response.js b/lib/proto/handle-response.js
new file mode 100644
index 0000000..e8196a8
--- /dev/null
+++ b/lib/proto/handle-response.js
@@ -0,0 +1,71 @@
+var clone = require("../util/clone");
+var newUid = require("../uniqueid");
+var trigger = require("../events/trigger");
+
+module.exports = function(responseText, request, href, options) {
+  options = clone(options || this.options);
+  options.request = request;
+
+  // Fail if unable to load HTML via AJAX
+  if (responseText === false) {
+    trigger(document, "pjax:complete pjax:error", options);
+
+    return;
+  }
+
+  // push scroll position to history
+  var currentState = window.history.state || {};
+  window.history.replaceState(
+    {
+      url: currentState.url || window.location.href,
+      title: currentState.title || document.title,
+      uid: currentState.uid || newUid(),
+      scrollPos: [
+        document.documentElement.scrollLeft || document.body.scrollLeft,
+        document.documentElement.scrollTop || document.body.scrollTop
+      ]
+    },
+    document.title,
+    window.location.href
+  );
+
+  // Check for redirects
+  var oldHref = href;
+  if (request.responseURL) {
+    if (href !== request.responseURL) {
+      href = request.responseURL;
+    }
+  } else if (request.getResponseHeader("X-PJAX-URL")) {
+    href = request.getResponseHeader("X-PJAX-URL");
+  } else if (request.getResponseHeader("X-XHR-Redirected-To")) {
+    href = request.getResponseHeader("X-XHR-Redirected-To");
+  }
+
+  // Add back the hash if it was removed
+  var a = document.createElement("a");
+  a.href = oldHref;
+  var oldHash = a.hash;
+  a.href = href;
+  if (oldHash && !a.hash) {
+    a.hash = oldHash;
+    href = a.href;
+  }
+
+  this.state.href = href;
+  this.state.options = options;
+
+  try {
+    this.loadContent(responseText, options);
+  } catch (e) {
+    trigger(document, "pjax:error", options);
+
+    if (!this.options.debug) {
+      if (console && console.error) {
+        console.error("Pjax switch fail: ", e);
+      }
+      return this.latestChance(href);
+    } else {
+      throw e;
+    }
+  }
+};
diff --git a/lib/proto/log.js b/lib/proto/log.js
new file mode 100644
index 0000000..08844b4
--- /dev/null
+++ b/lib/proto/log.js
@@ -0,0 +1,11 @@
+module.exports = function() {
+  if (this.options.debug && console) {
+    if (typeof console.log === "function") {
+      console.log.apply(console, arguments);
+    }
+    // IE is weird
+    else if (console.log) {
+      console.log(arguments);
+    }
+  }
+};
diff --git a/lib/proto/parse-element.js b/lib/proto/parse-element.js
new file mode 100644
index 0000000..1b596a2
--- /dev/null
+++ b/lib/proto/parse-element.js
@@ -0,0 +1,22 @@
+var attrState = "data-pjax-state";
+
+module.exports = function(el) {
+  switch (el.tagName.toLowerCase()) {
+    case "a":
+      // only attach link if el does not already have link attached
+      if (!el.hasAttribute(attrState)) {
+        this.attachLink(el);
+      }
+      break;
+
+    case "form":
+      // only attach link if el does not already have link attached
+      if (!el.hasAttribute(attrState)) {
+        this.attachForm(el);
+      }
+      break;
+
+    default:
+      throw "Pjax can only be applied on <a> or <form> submit";
+  }
+};
diff --git a/lib/send-request.js b/lib/send-request.js
new file mode 100644
index 0000000..ad7b1b1
--- /dev/null
+++ b/lib/send-request.js
@@ -0,0 +1,86 @@
+var updateQueryString = require("./util/update-query-string");
+
+module.exports = function(location, options, callback) {
+  options = options || {};
+  var queryString;
+  var requestOptions = options.requestOptions || {};
+  var requestMethod = (requestOptions.requestMethod || "GET").toUpperCase();
+  var requestParams = requestOptions.requestParams || null;
+  var formData = requestOptions.formData || null;
+  var requestPayload = null;
+  var request = new XMLHttpRequest();
+  var timeout = options.timeout || 0;
+
+  request.onreadystatechange = function() {
+    if (request.readyState === 4) {
+      if (request.status === 200) {
+        callback(request.responseText, request, location, options);
+      } else if (request.status !== 0) {
+        callback(null, request, location, options);
+      }
+    }
+  };
+
+  request.onerror = function(e) {
+    console.log(e);
+    callback(null, request, location, options);
+  };
+
+  request.ontimeout = function() {
+    callback(null, request, location, options);
+  };
+
+  // Prepare the request payload for forms, if available
+  if (requestParams && requestParams.length) {
+    // Build query string
+    queryString = requestParams
+      .map(function(param) {
+        return param.name + "=" + param.value;
+      })
+      .join("&");
+
+    switch (requestMethod) {
+      case "GET":
+        // Reset query string to avoid an issue with repeat submissions where checkboxes that were
+        // previously checked are incorrectly preserved
+        location = location.split("?")[0];
+
+        // Append new query string
+        location += "?" + queryString;
+        break;
+
+      case "POST":
+        // Send query string as request payload
+        requestPayload = queryString;
+        break;
+    }
+  } else if (formData) {
+    requestPayload = formData;
+  }
+
+  // Add a timestamp as part of the query string if cache busting is enabled
+  if (options.cacheBust) {
+    location = updateQueryString(location, "t", Date.now());
+  }
+
+  request.open(requestMethod, location, true);
+  request.timeout = timeout;
+  request.setRequestHeader("X-Requested-With", "XMLHttpRequest");
+  request.setRequestHeader("X-PJAX", "true");
+  request.setRequestHeader(
+    "X-PJAX-Selectors",
+    JSON.stringify(options.selectors)
+  );
+
+  // Send the proper header information for POST forms
+  if (requestPayload && requestMethod === "POST" && !formData) {
+    request.setRequestHeader(
+      "Content-Type",
+      "application/x-www-form-urlencoded"
+    );
+  }
+
+  request.send(requestPayload);
+
+  return request;
+};
diff --git a/lib/switches-selectors.js b/lib/switches-selectors.js
new file mode 100644
index 0000000..3ce680d
--- /dev/null
+++ b/lib/switches-selectors.js
@@ -0,0 +1,59 @@
+var forEachEls = require("./foreach-els");
+
+var defaultSwitches = require("./switches");
+
+module.exports = function(
+  switches,
+  switchesOptions,
+  selectors,
+  fromEl,
+  toEl,
+  options
+) {
+  var switchesQueue = [];
+
+  selectors.forEach(function(selector) {
+    var newEls = fromEl.querySelectorAll(selector);
+    var oldEls = toEl.querySelectorAll(selector);
+    if (this.log) {
+      this.log("Pjax switch", selector, newEls, oldEls);
+    }
+    if (newEls.length !== oldEls.length) {
+      throw "DOM doesn’t look the same on new loaded page: ’" +
+        selector +
+        "’ - new " +
+        newEls.length +
+        ", old " +
+        oldEls.length;
+    }
+
+    forEachEls(
+      newEls,
+      function(newEl, i) {
+        var oldEl = oldEls[i];
+        if (this.log) {
+          this.log("newEl", newEl, "oldEl", oldEl);
+        }
+
+        var callback = switches[selector]
+          ? switches[selector].bind(
+              this,
+              oldEl,
+              newEl,
+              options,
+              switchesOptions[selector]
+            )
+          : defaultSwitches.outerHTML.bind(this, oldEl, newEl, options);
+
+        switchesQueue.push(callback);
+      },
+      this
+    );
+  }, this);
+
+  this.state.numPendingSwitches = switchesQueue.length;
+
+  switchesQueue.forEach(function(queuedSwitch) {
+    queuedSwitch();
+  });
+};
diff --git a/lib/switches.js b/lib/switches.js
new file mode 100644
index 0000000..ce89fe5
--- /dev/null
+++ b/lib/switches.js
@@ -0,0 +1,140 @@
+var on = require("./events/on");
+
+module.exports = {
+  outerHTML: function(oldEl, newEl) {
+    oldEl.outerHTML = newEl.outerHTML;
+    this.onSwitch();
+  },
+
+  innerHTML: function(oldEl, newEl) {
+    oldEl.innerHTML = newEl.innerHTML;
+
+    if (newEl.className === "") {
+      oldEl.removeAttribute("class");
+    } else {
+      oldEl.className = newEl.className;
+    }
+
+    this.onSwitch();
+  },
+
+  switchElementsAlt: function(oldEl, newEl) {
+    oldEl.innerHTML = newEl.innerHTML;
+
+    // Copy attributes from the new element to the old one
+    if (newEl.hasAttributes()) {
+      var attrs = newEl.attributes;
+      for (var i = 0; i < attrs.length; i++) {
+        oldEl.attributes.setNamedItem(attrs[i].cloneNode());
+      }
+    }
+
+    this.onSwitch();
+  },
+
+  // Equivalent to outerHTML(), but doesn't require switchElementsAlt() for <head> and <body>
+  replaceNode: function(oldEl, newEl) {
+    oldEl.parentNode.replaceChild(newEl, oldEl);
+    this.onSwitch();
+  },
+
+  sideBySide: function(oldEl, newEl, options, switchOptions) {
+    var forEach = Array.prototype.forEach;
+    var elsToRemove = [];
+    var elsToAdd = [];
+    var fragToAppend = document.createDocumentFragment();
+    var animationEventNames =
+      "animationend webkitAnimationEnd MSAnimationEnd oanimationend";
+    var animatedElsNumber = 0;
+    var sexyAnimationEnd = function(e) {
+      if (e.target !== e.currentTarget) {
+        // end triggered by an animation on a child
+        return;
+      }
+
+      animatedElsNumber--;
+      if (animatedElsNumber <= 0 && elsToRemove) {
+        elsToRemove.forEach(function(el) {
+          // browsing quickly can make the el
+          // already removed by last page update ?
+          if (el.parentNode) {
+            el.parentNode.removeChild(el);
+          }
+        });
+
+        elsToAdd.forEach(function(el) {
+          el.className = el.className.replace(
+            el.getAttribute("data-pjax-classes"),
+            ""
+          );
+          el.removeAttribute("data-pjax-classes");
+        });
+
+        elsToAdd = null; // free memory
+        elsToRemove = null; // free memory
+
+        // this is to trigger some repaint (example: picturefill)
+        this.onSwitch();
+      }
+    }.bind(this);
+
+    switchOptions = switchOptions || {};
+
+    forEach.call(oldEl.childNodes, function(el) {
+      elsToRemove.push(el);
+      if (el.classList && !el.classList.contains("js-Pjax-remove")) {
+        // for fast switch, clean element that just have been added, & not cleaned yet.
+        if (el.hasAttribute("data-pjax-classes")) {
+          el.className = el.className.replace(
+            el.getAttribute("data-pjax-classes"),
+            ""
+          );
+          el.removeAttribute("data-pjax-classes");
+        }
+        el.classList.add("js-Pjax-remove");
+        if (switchOptions.callbacks && switchOptions.callbacks.removeElement) {
+          switchOptions.callbacks.removeElement(el);
+        }
+        if (switchOptions.classNames) {
+          el.className +=
+            " " +
+            switchOptions.classNames.remove +
+            " " +
+            (options.backward
+              ? switchOptions.classNames.backward
+              : switchOptions.classNames.forward);
+        }
+        animatedElsNumber++;
+        on(el, animationEventNames, sexyAnimationEnd, true);
+      }
+    });
+
+    forEach.call(newEl.childNodes, function(el) {
+      if (el.classList) {
+        var addClasses = "";
+        if (switchOptions.classNames) {
+          addClasses =
+            " js-Pjax-add " +
+            switchOptions.classNames.add +
+            " " +
+            (options.backward
+              ? switchOptions.classNames.forward
+              : switchOptions.classNames.backward);
+        }
+        if (switchOptions.callbacks && switchOptions.callbacks.addElement) {
+          switchOptions.callbacks.addElement(el);
+        }
+        el.className += addClasses;
+        el.setAttribute("data-pjax-classes", addClasses);
+        elsToAdd.push(el);
+        fragToAppend.appendChild(el);
+        animatedElsNumber++;
+        on(el, animationEventNames, sexyAnimationEnd, true);
+      }
+    });
+
+    // pass all className of the parent
+    oldEl.className = newEl.className;
+    oldEl.appendChild(fragToAppend);
+  }
+};
diff --git a/lib/uniqueid.js b/lib/uniqueid.js
new file mode 100644
index 0000000..81b8238
--- /dev/null
+++ b/lib/uniqueid.js
@@ -0,0 +1,8 @@
+module.exports = (function() {
+  var counter = 0;
+  return function() {
+    var id = "pjax" + new Date().getTime() + "_" + counter;
+    counter++;
+    return id;
+  };
+})();
diff --git a/lib/util/clone.js b/lib/util/clone.js
new file mode 100644
index 0000000..41e1c3b
--- /dev/null
+++ b/lib/util/clone.js
@@ -0,0 +1,13 @@
+module.exports = function(obj) {
+  /* istanbul ignore if */
+  if (null === obj || "object" !== typeof obj) {
+    return obj;
+  }
+  var copy = obj.constructor();
+  for (var attr in obj) {
+    if (obj.hasOwnProperty(attr)) {
+      copy[attr] = obj[attr];
+    }
+  }
+  return copy;
+};
diff --git a/lib/util/contains.js b/lib/util/contains.js
new file mode 100644
index 0000000..d030617
--- /dev/null
+++ b/lib/util/contains.js
@@ -0,0 +1,12 @@
+module.exports = function contains(doc, selectors, el) {
+  for (var i = 0; i < selectors.length; i++) {
+    var selectedEls = doc.querySelectorAll(selectors[i]);
+    for (var j = 0; j < selectedEls.length; j++) {
+      if (selectedEls[j].contains(el)) {
+        return true;
+      }
+    }
+  }
+
+  return false;
+};
diff --git a/lib/util/extend.js b/lib/util/extend.js
new file mode 100644
index 0000000..d81627e
--- /dev/null
+++ b/lib/util/extend.js
@@ -0,0 +1,21 @@
+module.exports = function(target) {
+  if (target == null) {
+    return null;
+  }
+
+  var to = Object(target);
+
+  for (var i = 1; i < arguments.length; i++) {
+    var source = arguments[i];
+
+    if (source != null) {
+      for (var key in source) {
+        // Avoid bugs when hasOwnProperty is shadowed
+        if (Object.prototype.hasOwnProperty.call(source, key)) {
+          to[key] = source[key];
+        }
+      }
+    }
+  }
+  return to;
+};
diff --git a/lib/util/noop.js b/lib/util/noop.js
new file mode 100644
index 0000000..0a55f34
--- /dev/null
+++ b/lib/util/noop.js
@@ -0,0 +1 @@
+module.exports = function() {};
diff --git a/lib/util/update-query-string.js b/lib/util/update-query-string.js
new file mode 100644
index 0000000..c952a26
--- /dev/null
+++ b/lib/util/update-query-string.js
@@ -0,0 +1,9 @@
+module.exports = function(uri, key, value) {
+  var re = new RegExp("([?&])" + key + "=.*?(&|$)", "i");
+  var separator = uri.indexOf("?") !== -1 ? "&" : "?";
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+};
diff --git a/package-lock.json b/package-lock.json
new file mode 100644
index 0000000..7f7d331
--- /dev/null
+++ b/package-lock.json
@@ -0,0 +1,9354 @@
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+      "dev": true
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+      "resolved": "https://registry.npmjs.org/xtend/-/xtend-4.0.1.tgz",
+      "integrity": "sha1-pcbVMr5lbiPbgg77lDofBJmNY68=",
+      "dev": true
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+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-2.1.2.tgz",
+      "integrity": "sha1-HBH5IY8HYImkfdUS+TxmmaaoHVI=",
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+}
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..0c60d6a
--- /dev/null
+++ b/package.json
@@ -0,0 +1,72 @@
+{
+  "name": "pjax",
+  "version": "0.2.8",
+  "description": "Easily enable fast AJAX navigation on any website (using pushState + XHR)",
+  "keywords": [
+    "pjax",
+    "pushstate",
+    "ajax",
+    "navigation",
+    "transition",
+    "animation"
+  ],
+  "repository": "https://github.com/MoOx/pjax.git",
+  "author": "Maxime Thirouin",
+  "contributors": [
+    "BehindTheMath",
+    "Robin North (http://robinnorth.co.uk)"
+  ],
+  "license": "MIT",
+  "main": "index.js",
+  "files": [
+    "index.js",
+    "lib",
+    "pjax.js",
+    "pjax.min.js",
+    "index.d.ts"
+  ],
+  "types": "index.d.ts",
+  "devDependencies": {
+    "browserify": "^15.0.0",
+    "eslint": "^5.7.0",
+    "eslint-config-i-am-meticulous": "^11.0.0",
+    "husky": "^1.2.0",
+    "jsdom": "^11.5.1",
+    "jsdom-global": "^3.0.2",
+    "lint-staged": "^8.1.0",
+    "npmpub": "^3.1.0",
+    "nyc": "^11.4.1",
+    "opn-cli": "^3.1.0",
+    "prettier": "^1.14.3",
+    "serve": "^6.4.4",
+    "tap-nyc": "^1.0.3",
+    "tap-spec": "^4.1.1",
+    "tape": "^4.8.0",
+    "uglify-js": "^3.3.8"
+  },
+  "scripts": {
+    "lint": "eslint .",
+    "standalone": "browserify index.js --standalone Pjax > pjax.js",
+    "build": "npm run standalone && uglifyjs pjax.js -o pjax.min.js",
+    "build-debug": "browserify index.js --debug --standalone Pjax > pjax.js",
+    "tests": "tape -r ./tests/setup.js \"./tests/**/*.js\"",
+    "test": "npm run lint && npm run tests | tap-spec",
+    "coverage-tests": "npm run tests | tap-nyc",
+    "coverage": "nyc -x \"tests/**\" npm run coverage-tests",
+    "example": "opn http://localhost:3000/example/ && serve -p 3000 .",
+    "prepublish": "npm run build",
+    "release": "npmpub"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "npm test && lint-staged"
+    }
+  },
+  "lint-staged": {
+    "*.js": [
+      "eslint --fix",
+      "prettier --write",
+      "git add"
+    ]
+  }
+}
diff --git a/tests/lib/abort-request.js b/tests/lib/abort-request.js
new file mode 100644
index 0000000..5c158f9
--- /dev/null
+++ b/tests/lib/abort-request.js
@@ -0,0 +1,55 @@
+var tape = require("tape");
+
+var abortRequest = require("../../lib/abort-request.js");
+var sendRequest = require("../../lib/send-request.js");
+
+// Polyfill responseURL property into XMLHttpRequest if it doesn't exist,
+// just for the purposes of this test
+// This polyfill is not complete; it won't show the updated location if a
+// redirection occurred, but it's fine for our purposes.
+if (!("responseURL" in XMLHttpRequest.prototype)) {
+  var nativeOpen = XMLHttpRequest.prototype.open;
+  XMLHttpRequest.prototype.open = function(method, url) {
+    this.responseURL = url;
+    return nativeOpen.apply(this, arguments);
+  };
+}
+
+tape("test aborting xhr request", function(t) {
+  var requestCacheBust = sendRequest.bind({
+    options: {
+      cacheBust: true
+    }
+  });
+
+  t.test("- pending request is aborted", function(t) {
+    var r = requestCacheBust("https://httpbin.org/delay/10", {}, function() {
+      t.fail("xhr was not aborted");
+    });
+    t.equal(r.readyState, 1, "xhr readyState is '1' (SENT)");
+    abortRequest(r);
+    t.equal(r.readyState, 0, "xhr readyState is '0' (ABORTED)");
+    t.equal(r.status, 0, "xhr HTTP status is '0' (ABORTED)");
+    t.equal(r.responseText, "", "xhr response is empty");
+    t.end();
+  });
+  t.test("- request is not aborted if it has already completed", function(t) {
+    var r = requestCacheBust("https://httpbin.org/get", {}, function() {
+      abortRequest(r);
+      t.equal(r.readyState, 4, "xhr readyState is '4' (DONE)");
+      t.equal(r.status, 200, "xhr HTTP status is '200' (OK)");
+      t.end();
+    });
+  });
+  t.test("- request is not aborted if it is undefined", function(t) {
+    var r;
+    try {
+      abortRequest(r);
+    } catch (e) {
+      t.fail("aborting an undefined request threw an error");
+    }
+    t.equal(typeof r, "undefined", "undefined xhr was ignored");
+    t.end();
+  });
+  t.end();
+});
diff --git a/tests/lib/eval-scripts.js b/tests/lib/eval-scripts.js
new file mode 100644
index 0000000..5f4e97d
--- /dev/null
+++ b/tests/lib/eval-scripts.js
@@ -0,0 +1,49 @@
+var tape = require("tape");
+
+var evalScript = require("../../lib/eval-script");
+
+tape("test evalScript method", function(t) {
+  document.body.className = "";
+
+  var script = document.createElement("script");
+  script.innerHTML = "document.body.className = 'executed'";
+
+  t.equal(document.body.className, "", "script hasn't been executed yet");
+
+  evalScript(script);
+  t.equal(
+    document.body.className,
+    "executed",
+    "script has been properly executed"
+  );
+
+  script.innerHTML = "document.write('failure')";
+  var bodyText = "document.write hasn't been executed";
+  document.body.text = bodyText;
+  evalScript(script);
+  t.equal(document.body.text, bodyText, "document.write hasn't been executed");
+
+  t.end();
+});
+
+tape(
+  "evalScript should not throw an error if the script removed itself",
+  function(t) {
+    var script = document.createElement("script");
+    script.id = "myScript";
+    script.innerHTML =
+      "const script = document.querySelector('#myScript');" +
+      "script.parentNode.removeChild(script);";
+
+    try {
+      evalScript(script);
+
+      t.pass("Missing script tested successfully");
+    } catch (e) {
+      console.error(e);
+      t.fail("Attempted to remove missing script");
+    }
+
+    t.end();
+  }
+);
diff --git a/tests/lib/events.js b/tests/lib/events.js
new file mode 100644
index 0000000..1237983
--- /dev/null
+++ b/tests/lib/events.js
@@ -0,0 +1,177 @@
+var tape = require("tape");
+
+var on = require("../../lib/events/on");
+var off = require("../../lib/events/off");
+var trigger = require("../../lib/events/trigger");
+
+var el = document.createElement("div");
+var el2 = document.createElement("span");
+var els = [el, el2];
+
+var classCb = function() {
+  this.className += "on";
+};
+var attrCb = function() {
+  this.setAttribute("data-state", this.getAttribute("data-state") + "ON");
+};
+
+tape("test events on/off/trigger for one element, one event", function(t) {
+  el.className = "";
+  on(el, "click", classCb);
+  trigger(el, "click");
+  t.equal(el.className, "on", "attached callback has been fired properly");
+
+  el.className = "off";
+  off(el, "click", classCb);
+  trigger(el, "click");
+  t.equal(el.className, "off", "triggered event didn't fire detached callback");
+
+  t.end();
+});
+
+tape("test events on/off/trigger for multiple elements, one event", function(
+  t
+) {
+  el.className = "";
+  el2.className = "";
+
+  on(els, "click", classCb);
+  trigger(els, "click");
+  t.equal(
+    el.className,
+    "on",
+    "attached callback has been fired properly on the first element"
+  );
+  t.equal(
+    el2.className,
+    "on",
+    "attached callback has been fired properly on the second element"
+  );
+
+  el.className = "off";
+  el2.className = "off";
+  off(els, "click", classCb);
+  trigger(els, "click");
+  t.equal(
+    el.className,
+    "off",
+    "triggered event didn't fire detached callback on the first element"
+  );
+  t.equal(
+    el2.className,
+    "off",
+    "triggered event didn't fire detached callback on the second element"
+  );
+
+  t.end();
+});
+
+tape("test events on/off/trigger for one element, multiple events", function(
+  t
+) {
+  el.className = "";
+  on(el, "click mouseover", classCb);
+  trigger(el, "click mouseover");
+  t.equal(el.className, "onon", "attached callbacks have been fired properly");
+
+  el.className = "off";
+  off(el, "click mouseover", classCb);
+  trigger(el, "click mouseover");
+  t.equal(
+    el.className,
+    "off",
+    "triggered events didn't fire detached callback"
+  );
+
+  t.end();
+});
+
+tape(
+  "test events on/off/trigger for multiple elements, multiple events",
+  function(t) {
+    el.className = "";
+    el2.className = "";
+    el.setAttribute("data-state", "");
+    el2.setAttribute("data-state", "");
+    on(els, "click mouseover", classCb);
+    on(els, "resize scroll", attrCb);
+    trigger(els, "click mouseover resize scroll");
+    t.equal(
+      el.className,
+      "onon",
+      "attached callbacks has been fired properly on the first element"
+    );
+    t.equal(
+      el.getAttribute("data-state"),
+      "ONON",
+      "attached callbacks has been fired properly on the first element"
+    );
+    t.equal(
+      el2.className,
+      "onon",
+      "attached callbacks has been fired properly on the second element"
+    );
+    t.equal(
+      el2.getAttribute("data-state"),
+      "ONON",
+      "attached callbacks has been fired properly on the second element"
+    );
+
+    el.className = "off";
+    el2.className = "off";
+    el.setAttribute("data-state", "off");
+    el2.setAttribute("data-state", "off");
+    off(els, "click mouseover", classCb);
+    off(els, "resize scroll", attrCb);
+    trigger(els, "click mouseover resize scroll");
+    t.equal(
+      el.className,
+      "off",
+      "triggered events didn't fire detached callbacks on the first element"
+    );
+    t.equal(
+      el.getAttribute("data-state"),
+      "off",
+      "triggered events didn't fire detached callbacks on the first element"
+    );
+    t.equal(
+      el2.className,
+      "off",
+      "triggered events didn't fire detached callbacks on the first element"
+    );
+    t.equal(
+      el2.getAttribute("data-state"),
+      "off",
+      "triggered events didn't fire detached callbacks on the first element"
+    );
+
+    t.end();
+  }
+);
+
+tape("test events on top level elements", function(t) {
+  var el = document;
+
+  el.className = "";
+  on(el, "click", classCb);
+  trigger(el, "click");
+  t.equal(
+    el.className,
+    "on",
+    "attached callback has been fired properly on document"
+  );
+
+  el = window;
+
+  el.className = "";
+  // With jsdom, the default this is global, not window, so we need to explicitly bind to window.
+  on(el, "click", classCb.bind(window));
+  trigger(el, "click");
+  t.equal(
+    el.className,
+    "on",
+    "attached callback has been fired properly on window"
+  );
+
+  t.end();
+});
diff --git a/tests/lib/execute-scripts.js b/tests/lib/execute-scripts.js
new file mode 100644
index 0000000..19de039
--- /dev/null
+++ b/tests/lib/execute-scripts.js
@@ -0,0 +1,49 @@
+var tape = require("tape");
+
+var executeScripts = require("../../lib/execute-scripts");
+
+tape(
+  "test executeScripts method when the script tag is inside a container",
+  function(t) {
+    document.body.className = "";
+
+    var container = document.createElement("div");
+    container.innerHTML =
+      "<" +
+      "script" +
+      ">document.body.className = 'executed';</" +
+      "script" +
+      "><" +
+      "script" +
+      ">document.body.className += ' correctly';</" +
+      "script" +
+      ">";
+
+    t.equal(document.body.className, "", "script hasn't been executed yet");
+    executeScripts(container);
+    t.equal(
+      document.body.className,
+      "executed correctly",
+      "script has been properly executed"
+    );
+
+    t.end();
+  }
+);
+
+tape("test executeScripts method with just a script tag", function(t) {
+  document.body.className = "";
+
+  var script = document.createElement("script");
+  script.innerHTML = "document.body.className = 'executed correctly';";
+
+  t.equal(document.body.className, "", "script hasn't been executed yet");
+  executeScripts(script);
+  t.equal(
+    document.body.className,
+    "executed correctly",
+    "script has been properly executed"
+  );
+
+  t.end();
+});
diff --git a/tests/lib/foreach-els.js b/tests/lib/foreach-els.js
new file mode 100644
index 0000000..59927ba
--- /dev/null
+++ b/tests/lib/foreach-els.js
@@ -0,0 +1,60 @@
+var tape = require("tape");
+
+var forEachEls = require("../../lib/foreach-els.js");
+
+var div = document.createElement("div");
+var span = document.createElement("span");
+var cb = function(el) {
+  el.innerHTML = "boom";
+};
+
+tape("test forEachEls on one element", function(t) {
+  div.innerHTML = "div tag";
+  forEachEls(div, cb);
+
+  t.equal(div.innerHTML, "boom", "works correctly on one element");
+  t.end();
+});
+
+tape("test forEachEls on an array", function(t) {
+  div.innerHTML = "div tag";
+  span.innerHTML = "span tag";
+
+  forEachEls([div, span], cb);
+
+  t.equal(
+    div.innerHTML,
+    "boom",
+    "works correctly on the first element of the array"
+  );
+  t.equal(
+    span.innerHTML,
+    "boom",
+    "works correctly on the last element of the array"
+  );
+
+  t.end();
+});
+
+tape("test forEachEls on a NodeList", function(t) {
+  div.innerHTML = "div tag";
+  span.innerHTML = "span tag";
+
+  var frag = document.createDocumentFragment();
+  frag.appendChild(div);
+  frag.appendChild(span);
+  forEachEls(frag.childNodes, cb);
+
+  t.equal(
+    div.innerHTML,
+    "boom",
+    "works correctly on the first element of the document fragment"
+  );
+  t.equal(
+    span.innerHTML,
+    "boom",
+    "works correctly on the last element of the document fragment"
+  );
+
+  t.end();
+});
diff --git a/tests/lib/foreach-selectors.js b/tests/lib/foreach-selectors.js
new file mode 100644
index 0000000..691026d
--- /dev/null
+++ b/tests/lib/foreach-selectors.js
@@ -0,0 +1,40 @@
+var tape = require("tape");
+
+var forEachEls = require("../../lib/foreach-selectors.js");
+
+var cb = function(el) {
+  el.className = "modified";
+};
+
+tape("test forEachSelector", function(t) {
+  forEachEls(["html", "body"], cb);
+
+  t.equal(
+    document.documentElement.className,
+    "modified",
+    "callback has been executed on first selector"
+  );
+  t.equal(
+    document.body.className,
+    "modified",
+    "callback has been executed on first selector"
+  );
+
+  document.documentElement.className = "";
+  document.body.className = "";
+
+  forEachEls(["html", "body"], cb, null, document.documentElement);
+
+  t.equal(
+    document.documentElement.className,
+    "",
+    "callback has not been executed on first selector when context is used"
+  );
+  t.equal(
+    document.body.className,
+    "modified",
+    "callback has been executed on first selector when context is used"
+  );
+
+  t.end();
+});
diff --git a/tests/lib/is-supported.js b/tests/lib/is-supported.js
new file mode 100644
index 0000000..a4405e4
--- /dev/null
+++ b/tests/lib/is-supported.js
@@ -0,0 +1,11 @@
+var tape = require("tape");
+
+var isSupported = require("../../lib/is-supported.js");
+
+tape("test isSupported method", function(t) {
+  t.true(
+    isSupported(),
+    "well, we run test on supported browser, so it should be ok here"
+  );
+  t.end();
+});
diff --git a/tests/lib/parse-options.js b/tests/lib/parse-options.js
new file mode 100644
index 0000000..36d2728
--- /dev/null
+++ b/tests/lib/parse-options.js
@@ -0,0 +1,50 @@
+var tape = require("tape");
+
+var parseOptions = require("../../lib/parse-options.js");
+
+tape("test parse initalization options function", function(t) {
+  t.test("- default options", function(t) {
+    var pjax = {};
+    pjax.options = parseOptions({});
+
+    t.equal(pjax.options.elements, "a[href], form[action]");
+    t.equal(pjax.options.selectors.length, 2, "selectors length");
+    t.equal(pjax.options.selectors[0], "title");
+    t.equal(pjax.options.selectors[1], ".js-Pjax");
+
+    t.equal(typeof pjax.options.switches, "object");
+    t.equal(Object.keys(pjax.options.switches).length, 2); // head and body
+
+    t.equal(typeof pjax.options.switchesOptions, "object");
+    t.equal(Object.keys(pjax.options.switchesOptions).length, 0);
+
+    t.equal(pjax.options.history, true);
+    t.equal(typeof pjax.options.analytics, "function");
+    t.equal(pjax.options.scrollTo, 0);
+    t.equal(pjax.options.scrollRestoration, true);
+    t.equal(pjax.options.cacheBust, true);
+    t.equal(pjax.options.debug, false);
+    t.equal(pjax.options.currentUrlFullReload, false);
+    t.end();
+  });
+
+  // verify analytics always ends up as a function even when passed not a function
+  t.test("- analytics is a function", function(t) {
+    var pjax = {};
+    pjax.options = parseOptions({ analytics: "some string" });
+
+    t.deepEqual(typeof pjax.options.analytics, "function");
+    t.end();
+  });
+
+  // verify that the value false for scrollTo is not squashed
+  t.test("- scrollTo remains false", function(t) {
+    var pjax = {};
+    pjax.options = parseOptions({ scrollTo: false });
+
+    t.deepEqual(pjax.options.scrollTo, false);
+    t.end();
+  });
+
+  t.end();
+});
diff --git a/tests/lib/proto/attach-form.js b/tests/lib/proto/attach-form.js
new file mode 100644
index 0000000..6e551fc
--- /dev/null
+++ b/tests/lib/proto/attach-form.js
@@ -0,0 +1,231 @@
+var tape = require("tape");
+
+var on = require("../../../lib/events/on");
+var trigger = require("../../../lib/events/trigger");
+var attachForm = require("../../../lib/proto/attach-form");
+
+var attr = "data-pjax-state";
+
+tape("test attach form prototype method", function(t) {
+  var form = document.createElement("form");
+  var loadUrlCalled = false;
+
+  attachForm.call(
+    {
+      options: {
+        currentUrlFullReload: true
+      },
+      loadUrl: function() {
+        loadUrlCalled = true;
+      }
+    },
+    form
+  );
+
+  var internalUri =
+    window.location.protocol +
+    "//" +
+    window.location.host +
+    window.location.pathname +
+    window.location.search;
+
+  form.action = "http://external.com/";
+  trigger(form, "submit");
+  t.equal(form.getAttribute(attr), "external", "external url stop behavior");
+
+  form.action = internalUri + "#anchor";
+  trigger(form, "submit");
+  t.equal(form.getAttribute(attr), "anchor", "internal anchor stop behavior");
+
+  window.location.hash = "#anchor";
+  form.action = internalUri + "#another-anchor";
+  trigger(form, "submit");
+  t.equal(form.getAttribute(attr), "anchor", "different anchors stop behavior");
+  window.location.hash = "";
+
+  form.action = internalUri + "#";
+  trigger(form, "submit");
+  t.equal(
+    form.getAttribute(attr),
+    "anchor-empty",
+    "empty anchor stop behavior"
+  );
+
+  form.action = window.location.href;
+  trigger(form, "submit");
+  t.equal(
+    form.getAttribute(attr),
+    "reload",
+    "submitting when currentUrlFullReload is true will submit normally, without XHR"
+  );
+  t.equal(loadUrlCalled, false, "loadUrl() not called");
+
+  form.action =
+    window.location.protocol + "//" + window.location.host + "/internal";
+  form.method = "POST";
+  trigger(form, "submit");
+  t.equal(
+    form.getAttribute(attr),
+    "submit",
+    "triggering a POST request to the next page"
+  );
+  t.equal(loadUrlCalled, true, "loadUrl() called correctly");
+
+  loadUrlCalled = false;
+  form.setAttribute(attr, "");
+  form.action =
+    window.location.protocol + "//" + window.location.host + "/internal";
+  form.method = "GET";
+  trigger(form, "submit");
+  t.equal(
+    form.getAttribute(attr),
+    "submit",
+    "triggering a GET request to the next page"
+  );
+  t.equal(loadUrlCalled, true, "loadUrl() called correctly");
+
+  t.end();
+});
+
+tape("test attach form preventDefaulted events", function(t) {
+  var loadUrlCalled = false;
+  var form = document.createElement("form");
+
+  // This needs to be before the call to attachForm()
+  on(form, "submit", function(event) {
+    event.preventDefault();
+  });
+
+  attachForm.call(
+    {
+      options: {},
+      loadUrl: function() {
+        loadUrlCalled = true;
+      }
+    },
+    form
+  );
+
+  form.action = "#";
+  trigger(form, "submit");
+  t.equal(
+    loadUrlCalled,
+    false,
+    "events that are preventDefaulted should not fire callback"
+  );
+
+  t.end();
+});
+
+tape("test options are not modified by attachForm", function(t) {
+  var form = document.createElement("form");
+  var options = { foo: "bar" };
+  var loadUrl = function() {};
+
+  attachForm.call({ options: options, loadUrl: loadUrl }, form);
+
+  form.action =
+    window.location.protocol +
+    "//" +
+    window.location.host +
+    window.location.pathname +
+    window.location.search;
+  form.method = "GET";
+  trigger(form, "submit");
+
+  t.equal(
+    1,
+    Object.keys(options).length,
+    "options object that is passed in should not be modified"
+  );
+  t.equal(
+    "bar",
+    options.foo,
+    "options object that is passed in should not be modified"
+  );
+
+  t.end();
+});
+
+tape("test form elements parsed correctly", function(t) {
+  t.plan(1);
+
+  var form = document.createElement("form");
+  var input = document.createElement("input");
+  input.name = "input";
+  input.value = "value";
+  form.appendChild(input);
+
+  var params = [
+    {
+      name: "input",
+      value: "value"
+    }
+  ];
+  var pjax = {
+    options: {},
+    loadUrl: function(href, options) {
+      t.same(
+        options.requestOptions.requestParams,
+        params,
+        "form elements parsed correctly"
+      );
+    }
+  };
+
+  attachForm.call(pjax, form);
+
+  form.action =
+    window.location.protocol + "//" + window.location.host + "/internal";
+
+  trigger(form, "submit");
+  // see loadUrl defined above
+
+  t.end();
+});
+
+tape('test form.enctype="multipart/form-data"', function(t) {
+  t.plan(4);
+
+  var form = document.createElement("form");
+  form.enctype = "multipart/form-data";
+  var input = document.createElement("input");
+  input.name = "input";
+  input.value = "value";
+  form.appendChild(input);
+
+  var pjax = {
+    options: {},
+    loadUrl: function(href, options) {
+      t.equals(
+        options.requestOptions.requestParams,
+        undefined,
+        "form elements not parsed manually"
+      );
+      t.true(
+        options.requestOptions.formData instanceof FormData,
+        "requestOptions.formData is a FormData"
+      );
+      t.equals(
+        Array.from(options.requestOptions.formData.entries()).length,
+        1,
+        "correct number of FormData elements"
+      );
+      t.equals(
+        options.requestOptions.formData.get("input"),
+        "value",
+        "FormData element value set correctly"
+      );
+    }
+  };
+
+  attachForm.call(pjax, form);
+
+  form.action =
+    window.location.protocol + "//" + window.location.host + "/internal";
+
+  trigger(form, "submit");
+  // see loadUrl defined above
+
+  t.end();
+});
diff --git a/tests/lib/proto/attach-link.js b/tests/lib/proto/attach-link.js
new file mode 100644
index 0000000..6cce2e7
--- /dev/null
+++ b/tests/lib/proto/attach-link.js
@@ -0,0 +1,190 @@
+var tape = require("tape");
+
+var on = require("../../../lib/events/on");
+var trigger = require("../../../lib/events/trigger");
+var attachLink = require("../../../lib/proto/attach-link");
+
+var attr = "data-pjax-state";
+
+tape("test attach link prototype method", function(t) {
+  var a = document.createElement("a");
+  var loadUrlCalled = false;
+
+  attachLink.call(
+    {
+      options: {},
+      loadUrl: function() {
+        loadUrlCalled = true;
+      }
+    },
+    a
+  );
+
+  var internalUri =
+    window.location.protocol +
+    "//" +
+    window.location.host +
+    window.location.pathname +
+    window.location.search;
+
+  a.href = internalUri;
+  trigger(a, "click", { metaKey: true });
+  t.equal(a.getAttribute(attr), "modifier", "event key modifier stop behavior");
+
+  a.href = "http://external.com/";
+  trigger(a, "click");
+  t.equal(a.getAttribute(attr), "external", "external url stop behavior");
+
+  window.location.hash = "#anchor";
+  a.href = internalUri + "#anchor";
+  trigger(a, "click");
+  t.equal(a.getAttribute(attr), "anchor", "internal anchor stop behavior");
+
+  a.href = internalUri + "#another-anchor";
+  trigger(a, "click");
+  t.equal(a.getAttribute(attr), "anchor", "different anchors stop behavior");
+  window.location.hash = "";
+
+  a.href = internalUri + "#";
+  trigger(a, "click");
+  t.equal(a.getAttribute(attr), "anchor-empty", "empty anchor stop behavior");
+
+  a.href = window.location.protocol + "//" + window.location.host + "/internal";
+  trigger(a, "click");
+  t.equals(
+    a.getAttribute(attr),
+    "load",
+    "triggering an internal link sets the state attribute to 'load'"
+  );
+  t.equals(
+    loadUrlCalled,
+    true,
+    "triggering an internal link actually loads the page"
+  );
+
+  t.end();
+});
+
+tape("test attach link preventDefaulted events", function(t) {
+  var loadUrlCalled = false;
+  var a = document.createElement("a");
+
+  // This needs to be before the call to attachLink()
+  on(a, "click", function(event) {
+    event.preventDefault();
+  });
+
+  attachLink.call(
+    {
+      options: {},
+      loadUrl: function() {
+        loadUrlCalled = true;
+      }
+    },
+    a
+  );
+
+  a.href = "#";
+  trigger(a, "click");
+  t.equal(
+    loadUrlCalled,
+    false,
+    "events that are preventDefaulted should not fire callback"
+  );
+
+  t.end();
+});
+
+tape("test options are not modified by attachLink", function(t) {
+  var a = document.createElement("a");
+  var options = { foo: "bar" };
+  var loadUrl = function() {};
+
+  attachLink.call({ options: options, loadUrl: loadUrl }, a);
+
+  a.href =
+    window.location.protocol +
+    "//" +
+    window.location.host +
+    window.location.pathname +
+    window.location.search;
+
+  trigger(a, "click");
+
+  t.equal(
+    1,
+    Object.keys(options).length,
+    "options object that is passed in should not be modified"
+  );
+  t.equal(
+    "bar",
+    options.foo,
+    "options object that is passed in should not be modified"
+  );
+
+  t.end();
+});
+
+tape("test link triggered by keyboard", function(t) {
+  var a = document.createElement("a");
+  var pjax = {
+    options: {},
+    loadUrl: function() {
+      t.equal(
+        a.getAttribute(attr),
+        "load",
+        "triggering a internal link actually loads the page"
+      );
+    }
+  };
+
+  t.plan(3);
+
+  attachLink.call(pjax, a);
+
+  a.href = window.location.protocol + "//" + window.location.host + "/internal";
+
+  trigger(a, "keyup", { keyCode: 14 });
+  t.equal(
+    a.getAttribute(attr),
+    "",
+    "keycode other than 13 doesn't trigger anything"
+  );
+
+  trigger(a, "keyup", { keyCode: 13, metaKey: true });
+  t.equal(a.getAttribute(attr), "modifier", "event key modifier stop behavior");
+
+  trigger(a, "keyup", { keyCode: 13 });
+  // see loadUrl defined above
+
+  t.end();
+});
+
+tape(
+  "test link with the same URL as the current one, when currentUrlFullReload set to true",
+  function(t) {
+    var a = document.createElement("a");
+    var pjax = {
+      options: {
+        currentUrlFullReload: true
+      },
+      reload: function() {
+        t.pass("this.reload() was called correctly");
+      },
+      loadUrl: function() {
+        t.fail("loadUrl() was called wrongly");
+      }
+    };
+
+    t.plan(2);
+
+    attachLink.call(pjax, a);
+
+    a.href = window.location.href;
+
+    trigger(a, "click");
+    t.equal(a.getAttribute(attr), "reload", "reload stop behavior");
+
+    t.end();
+  }
+);
diff --git a/tests/lib/proto/handle-response.js b/tests/lib/proto/handle-response.js
new file mode 100644
index 0000000..4bb7a09
--- /dev/null
+++ b/tests/lib/proto/handle-response.js
@@ -0,0 +1,293 @@
+var tape = require("tape");
+
+var handleResponse = require("../../../lib/proto/handle-response");
+var noop = require("../../../lib/util/noop");
+var loadContent = require("../../../index").prototype.loadContent;
+
+var href = "https://example.org/";
+
+var storeEventHandler;
+var pjaxErrorEventTriggerTest;
+
+tape("test events triggered when handleResponse(false) is called", function(t) {
+  t.plan(3);
+
+  var pjax = {
+    options: {
+      test: 1
+    }
+  };
+
+  var events = [];
+
+  storeEventHandler = function(e) {
+    events.push(e.type);
+
+    t.equal(e.test, 1);
+  };
+
+  document.addEventListener("pjax:complete", storeEventHandler);
+  document.addEventListener("pjax:error", storeEventHandler);
+
+  handleResponse.bind(pjax)(false, null);
+
+  t.same(
+    events,
+    ["pjax:complete", "pjax:error"],
+    "calling handleResponse(false) triggers 'pjax:complete' and 'pjax:error'"
+  );
+
+  document.removeEventListener("pjax:complete", storeEventHandler);
+  document.removeEventListener("pjax:error", storeEventHandler);
+
+  t.end();
+});
+
+tape("test when handleResponse() is called normally", function(t) {
+  var pjax = {
+    options: {
+      test: 1
+    },
+    loadContent: noop,
+    state: {}
+  };
+
+  var request = {
+    getResponseHeader: noop
+  };
+
+  handleResponse.bind(pjax)("", request, "href");
+
+  delete window.history.state.uid;
+  t.same(
+    window.history.state,
+    {
+      url: href,
+      title: "",
+      scrollPos: [0, 0]
+    },
+    "window.history.state is set correctly"
+  );
+  t.equals(pjax.state.href, "href", "this.state.href is set correctly");
+  t.equals(
+    Object.keys(pjax.state.options).length,
+    2,
+    "this.state.options is set correctly"
+  );
+  t.same(
+    pjax.state.options.request,
+    request,
+    "this.state.options is set correctly"
+  );
+  t.equals(pjax.state.options.test, 1, "this.state.options is set correctly");
+
+  t.end();
+});
+
+tape(
+  "test when handleResponse() is called normally with request.responseURL",
+  function(t) {
+    var pjax = {
+      options: {},
+      loadContent: noop,
+      state: {}
+    };
+
+    var request = {
+      responseURL: href + "1",
+      getResponseHeader: noop
+    };
+
+    handleResponse.bind(pjax)("", request, "");
+
+    t.equals(
+      pjax.state.href,
+      request.responseURL,
+      "this.state.href is set correctly"
+    );
+
+    t.end();
+  }
+);
+
+tape("test when handleResponse() is called normally with X-PJAX-URL", function(
+  t
+) {
+  var pjax = {
+    options: {},
+    loadContent: noop,
+    state: {}
+  };
+
+  var request = {
+    getResponseHeader: function(header) {
+      if (header === "X-PJAX-URL") {
+        return href + "2";
+      }
+    }
+  };
+
+  handleResponse.bind(pjax)("", request, "");
+
+  t.equals(pjax.state.href, href + "2", "this.state.href is set correctly");
+
+  t.end();
+});
+
+tape(
+  "test when handleResponse() is called normally with X-XHR-Redirected-To",
+  function(t) {
+    var pjax = {
+      options: {},
+      loadContent: noop,
+      state: {}
+    };
+
+    var request = {
+      getResponseHeader: function(header) {
+        if (header === "X-XHR-Redirected-To") {
+          return href + "3";
+        }
+      }
+    };
+
+    handleResponse.bind(pjax)("", request, "");
+
+    t.equals(pjax.state.href, href + "3", "this.state.href is set correctly");
+
+    t.end();
+  }
+);
+
+tape("test when handleResponse() is called normally with a hash", function(t) {
+  var pjax = {
+    options: {},
+    loadContent: noop,
+    state: {}
+  };
+
+  var request = {
+    responseURL: href + "2",
+    getResponseHeader: noop
+  };
+
+  handleResponse.bind(pjax)("", request, href + "1#test");
+
+  t.equals(
+    pjax.state.href,
+    href + "2#test",
+    "this.state.href is set correctly"
+  );
+
+  t.end();
+});
+
+tape("test try...catch for loadContent() when options.debug is true", function(
+  t
+) {
+  t.plan(2);
+
+  var pjax = {
+    options: {},
+    loadContent: noop,
+    state: {}
+  };
+
+  var request = {
+    getResponseHeader: noop
+  };
+
+  pjax.loadContent = function() {
+    throw new Error();
+  };
+  pjax.options.debug = true;
+
+  document.removeEventListener("pjax:error", storeEventHandler);
+  pjaxErrorEventTriggerTest = function() {
+    t.pass("pjax:error event triggered");
+  };
+  document.addEventListener("pjax:error", pjaxErrorEventTriggerTest);
+
+  t.throws(
+    function() {
+      handleResponse.bind(pjax)("", request, "");
+    },
+    Error,
+    "error is rethrown"
+  );
+
+  t.end();
+});
+
+tape("test try...catch for loadContent()", function(t) {
+  t.plan(2);
+
+  var pjax = {
+    options: {},
+    loadContent: noop,
+    state: {}
+  };
+
+  var request = {
+    getResponseHeader: noop
+  };
+
+  pjax.loadContent = function() {
+    throw new Error();
+  };
+  pjax.latestChance = function() {
+    return true;
+  };
+  pjax.options.debug = false;
+
+  document.removeEventListener("pjax:error", pjaxErrorEventTriggerTest);
+
+  t.doesNotThrow(
+    function() {
+      t.equals(
+        handleResponse.bind(pjax)("", request, ""),
+        true,
+        "this.latestChance() is called"
+      );
+    },
+    Error,
+    "error is not thrown"
+  );
+
+  t.end();
+});
+
+tape(
+  "test events triggered when loadContent() is called with a non-string html argument",
+  function(t) {
+    t.plan(3);
+
+    var options = {
+      test: 1
+    };
+
+    var events = [];
+
+    storeEventHandler = function(e) {
+      events.push(e.type);
+
+      t.equal(e.test, 1);
+    };
+
+    document.addEventListener("pjax:complete", storeEventHandler);
+    document.addEventListener("pjax:error", storeEventHandler);
+
+    loadContent(null, options);
+
+    t.same(
+      events,
+      ["pjax:complete", "pjax:error"],
+      "calling loadContent() with a non-string html argument triggers 'pjax:complete' and 'pjax:error'"
+    );
+
+    document.removeEventListener("pjax:complete", storeEventHandler);
+    document.removeEventListener("pjax:error", storeEventHandler);
+
+    t.end();
+  }
+);
diff --git a/tests/lib/proto/parse-element.js b/tests/lib/proto/parse-element.js
new file mode 100644
index 0000000..6b09ff7
--- /dev/null
+++ b/tests/lib/proto/parse-element.js
@@ -0,0 +1,31 @@
+var tape = require("tape");
+
+var parseElement = require("../../../lib/proto/parse-element");
+
+var pjax = {
+  attachLink: function() {
+    return true;
+  },
+  attachForm: function() {
+    return true;
+  }
+};
+
+tape("test parse element prototype method", function(t) {
+  t.doesNotThrow(function() {
+    var a = document.createElement("a");
+    parseElement.call(pjax, a);
+  }, "<a> element can be parsed");
+
+  t.doesNotThrow(function() {
+    var form = document.createElement("form");
+    parseElement.call(pjax, form);
+  }, "<form> element can be parsed");
+
+  t.throws(function() {
+    var el = document.createElement("div");
+    parseElement.call(pjax, el);
+  }, "<div> element cannot be parsed");
+
+  t.end();
+});
diff --git a/tests/lib/send-request.js b/tests/lib/send-request.js
new file mode 100644
index 0000000..9f20410
--- /dev/null
+++ b/tests/lib/send-request.js
@@ -0,0 +1,165 @@
+var tape = require("tape");
+
+var sendRequest = require("../../lib/send-request.js");
+
+// Polyfill responseURL property into XMLHttpRequest if it doesn't exist,
+// just for the purposes of this test
+// This polyfill is not complete; it won't show the updated location if a
+// redirection occurred, but it's fine for our purposes.
+if (!("responseURL" in XMLHttpRequest.prototype)) {
+  var nativeOpen = XMLHttpRequest.prototype.open;
+  XMLHttpRequest.prototype.open = function(method, url) {
+    this.responseURL = url;
+    return nativeOpen.apply(this, arguments);
+  };
+}
+
+tape("test xhr request", function(t) {
+  var url = "https://httpbin.org/get";
+
+  t.test("- request is made, gets a result, and is cache-busted", function(t) {
+    var r = sendRequest(url, { cacheBust: true }, function(result) {
+      t.equal(
+        r.responseURL.indexOf("?"),
+        url.length,
+        "XHR URL is cache-busted when configured to be"
+      );
+      try {
+        result = JSON.parse(result);
+      } catch (e) {
+        t.fail("xhr doesn't get a JSON response");
+      }
+      t.same(typeof result, "object", "xhr request get a result");
+      t.end();
+    });
+  });
+  t.test("- request is not cache-busted when configured not to be", function(
+    t
+  ) {
+    var r = sendRequest(url, {}, function() {
+      t.equal(r.responseURL, url, "XHR URL is left untouched");
+      t.end();
+    });
+  });
+  t.end();
+});
+
+tape("request headers are sent properly", function(t) {
+  var url = "https://httpbin.org/headers";
+  var options = {
+    selectors: ["div.pjax", "div.container"]
+  };
+
+  sendRequest(url, options, function(responseText) {
+    var headers = JSON.parse(responseText).headers;
+
+    t.equals(
+      headers["X-Requested-With"],
+      "XMLHttpRequest",
+      "X-Requested-With header is set correctly"
+    );
+    // Httpbin.org changes the case to 'X-Pjax'
+    t.equals(headers["X-Pjax"], "true", "X-PJAX header is set correctly");
+    t.equals(
+      headers["X-Pjax-Selectors"],
+      '["div.pjax","div.container"]',
+      "X-PJAX-Selectors header is set correctly"
+    );
+
+    t.end();
+  });
+});
+
+tape("HTTP status codes other than 200 are handled properly", function(t) {
+  var url = "https://httpbin.org/status/400";
+
+  sendRequest(url, {}, function(responseText, request) {
+    t.equals(responseText, null, "responseText is null");
+    t.equals(request.status, 400, "HTTP status code is correct");
+
+    t.end();
+  });
+});
+
+tape.skip("XHR error is handled properly", function(t) {
+  var url = "https://encrypted.google.com/foobar";
+
+  sendRequest(url, {}, function(responseText) {
+    t.equals(responseText, null, "responseText is null");
+
+    t.end();
+  });
+});
+
+tape("POST body data is sent properly", function(t) {
+  var url = "https://httpbin.org/post";
+  var params = [
+    {
+      name: "test",
+      value: "1"
+    }
+  ];
+  var options = {
+    requestOptions: {
+      requestMethod: "POST",
+      requestParams: params
+    }
+  };
+
+  sendRequest(url, options, function(responseText) {
+    var response = JSON.parse(responseText);
+
+    t.same(
+      response.form[params[0].name],
+      params[0].value,
+      "requestParams were sent properly"
+    );
+    t.equals(
+      response.headers["Content-Type"],
+      "application/x-www-form-urlencoded",
+      "Content-Type header was set properly"
+    );
+
+    t.end();
+  });
+});
+
+tape("GET query data is sent properly", function(t) {
+  var url = "https://httpbin.org/get";
+  var params = [
+    {
+      name: "test",
+      value: "1"
+    }
+  ];
+  var options = {
+    requestOptions: {
+      requestParams: params
+    }
+  };
+
+  sendRequest(url, options, function(responseText) {
+    var response = JSON.parse(responseText);
+
+    t.same(
+      response.args[params[0].name],
+      params[0].value,
+      "requestParams were sent properly"
+    );
+
+    t.end();
+  });
+});
+
+tape("XHR timeout is handled properly", function(t) {
+  var url = "https://httpbin.org/delay/5";
+  var options = {
+    timeout: 1000
+  };
+
+  sendRequest(url, options, function(responseText) {
+    t.equals(responseText, null, "responseText is null");
+
+    t.end();
+  });
+});
diff --git a/tests/lib/switch-selectors.js b/tests/lib/switch-selectors.js
new file mode 100644
index 0000000..66a5ff5
--- /dev/null
+++ b/tests/lib/switch-selectors.js
@@ -0,0 +1,84 @@
+var tape = require("tape");
+
+var switchesSelectors = require("../../lib/switches-selectors.js");
+var noop = require("../../lib/util/noop");
+
+var pjax = {
+  onSwitch: function() {
+    console.log("Switched");
+  },
+  state: {},
+  log: noop
+};
+
+// @author darylteo
+tape("test switchesSelectors", function(t) {
+  // switchesSelectors relies on a higher level function callback
+  // should really be passed in instead so I'll leave it here as a TODO:
+  var tmpEl = document.implementation.createHTMLDocument();
+
+  // a div container is used because swapping the containers
+  // will generate a new element, so things get weird
+  // using "body" generates a lot of testling cruft that I don't
+  // want so let's avoid that
+  var container = document.createElement("div");
+  container.innerHTML = "<p>Original Text</p><span>No Change</span>";
+  document.body.appendChild(container);
+
+  var container2 = tmpEl.createElement("div");
+  container2.innerHTML = "<p>New Text</p><span>New Span</span>";
+  tmpEl.body.appendChild(container2);
+
+  switchesSelectors.bind(pjax)(
+    {}, // switches
+    {}, // switchesOptions
+    ["p"], // selectors,
+    tmpEl, // fromEl
+    document, // toEl,
+    {} // options
+  );
+
+  t.equals(
+    container.innerHTML,
+    "<p>New Text</p><span>No Change</span>",
+    "Elements correctly switched"
+  );
+
+  t.end();
+});
+
+tape("test switchesSelectors when number of elements don't match", function(t) {
+  var newTempDoc = document.implementation.createHTMLDocument();
+  var originalTempDoc = document.implementation.createHTMLDocument();
+
+  // a div container is used because swapping the containers
+  // will generate a new element, so things get weird
+  // using "body" generates a lot of testling cruft that I don't
+  // want so let's avoid that
+  var container = originalTempDoc.createElement("div");
+  container.innerHTML = "<p>Original text</p><span>No change</span>";
+  originalTempDoc.body.appendChild(container);
+
+  var container2 = newTempDoc.createElement("div");
+  container2.innerHTML =
+    "<p>New text</p><p>More new text</p><span>New span</span>";
+  newTempDoc.body.appendChild(container2);
+
+  var switchSelectorsFn = switchesSelectors.bind(
+    pjax,
+    {}, // switches
+    {}, // switchesOptions
+    ["p"], // selectors,
+    newTempDoc, // fromEl
+    originalTempDoc, // toEl,
+    {} // options
+  );
+
+  t.throws(
+    switchSelectorsFn,
+    null,
+    "error was thrown properly since number of elements don't match"
+  );
+
+  t.end();
+});
diff --git a/tests/lib/switches.js b/tests/lib/switches.js
new file mode 100644
index 0000000..6a54b54
--- /dev/null
+++ b/tests/lib/switches.js
@@ -0,0 +1,94 @@
+var tape = require("tape");
+var switches = require("../../lib/switches");
+var noop = require("../../lib/util/noop");
+
+tape("test outerHTML switch", function(t) {
+  var outerHTML = switches.outerHTML;
+
+  var doc = document.implementation.createHTMLDocument();
+
+  var container = doc.createElement("div");
+  container.innerHTML = "<p id='p'>Original Text</p>";
+  doc.body.appendChild(container);
+
+  var p = doc.createElement("p");
+  p.innerHTML = "New Text";
+
+  outerHTML.bind({
+    onSwitch: noop
+  })(doc.querySelector("p"), p);
+
+  t.equals(
+    doc.querySelector("p").innerHTML,
+    "New Text",
+    "Elements correctly switched"
+  );
+  t.notEquals(
+    doc.querySelector("p").id,
+    "p",
+    "other attributes overwritten correctly"
+  );
+
+  t.end();
+});
+
+tape("test innerHTML switch", function(t) {
+  var innerHTML = switches.innerHTML;
+
+  var doc = document.implementation.createHTMLDocument();
+
+  var container = doc.createElement("div");
+  container.innerHTML = "<p id='p'>Original Text</p>";
+  doc.body.appendChild(container);
+
+  var p = doc.createElement("p");
+  p.innerHTML = "New Text";
+  p.className = "p";
+
+  innerHTML.bind({
+    onSwitch: noop
+  })(doc.querySelector("p"), p);
+
+  t.equals(
+    doc.querySelector("p").innerHTML,
+    "New Text",
+    "Elements correctly switched"
+  );
+  t.equals(doc.querySelector("p").className, "p", "classname set correctly");
+  t.equals(doc.querySelector("p").id, "p", "other attributes set correctly");
+
+  p.removeAttribute("class");
+
+  innerHTML.bind({
+    onSwitch: noop
+  })(doc.querySelector("p"), p);
+
+  t.equals(doc.querySelector("p").className, "", "classname set correctly");
+
+  t.end();
+});
+
+tape("test replaceNode switch", function(t) {
+  var replaceNode = switches.replaceNode;
+
+  var doc = document.implementation.createHTMLDocument();
+
+  var container = doc.createElement("div");
+  container.innerHTML = "<p>Original Text</p>";
+  doc.body.appendChild(container);
+
+  var p = doc.createElement("p");
+  p.innerHTML = "New Text";
+
+  replaceNode.bind({
+    onSwitch: noop
+  })(doc.querySelector("p"), p);
+
+  t.equals(
+    doc.querySelector("div").innerHTML,
+    "<p>New Text</p>",
+    "Elements correctly switched"
+  );
+
+  t.end();
+});
diff --git a/tests/lib/uniqueid.js b/tests/lib/uniqueid.js
new file mode 100644
index 0000000..b5bd237
--- /dev/null
+++ b/tests/lib/uniqueid.js
@@ -0,0 +1,12 @@
+var tape = require("tape");
+
+var uniqueid = require("../../lib/uniqueid.js");
+
+tape("test uniqueid", function(t) {
+  var a = uniqueid();
+  var b = uniqueid();
+
+  t.notEqual(a, b, "Two calls to uniqueid produce different values");
+
+  t.end();
+});
diff --git a/tests/lib/util/clone.js b/tests/lib/util/clone.js
new file mode 100644
index 0000000..f89aa1f
--- /dev/null
+++ b/tests/lib/util/clone.js
@@ -0,0 +1,21 @@
+var tape = require("tape");
+
+var clone = require("../../../lib/util/clone");
+
+tape("test clone method", function(t) {
+  var obj = { one: 1, two: 2 };
+  var cloned = clone(obj);
+
+  t.notEqual(obj, cloned, "cloned object isn't the original object");
+
+  t.same(obj, cloned, "cloned object has the same values as original object");
+
+  cloned.three = 3;
+  t.notSame(
+    obj,
+    cloned,
+    "modified cloned object doesn't have the same values as original object"
+  );
+
+  t.end();
+});
diff --git a/tests/lib/util/contains.js b/tests/lib/util/contains.js
new file mode 100644
index 0000000..1741fde
--- /dev/null
+++ b/tests/lib/util/contains.js
@@ -0,0 +1,25 @@
+var tape = require("tape");
+
+var contains = require("../../../lib/util/contains.js");
+
+tape("test contains function", function(t) {
+  var tempDoc = document.implementation.createHTMLDocument();
+  tempDoc.body.innerHTML =
+    "<div><p id='el' class='js-Pjax'></p></div><span></span>";
+  var selectors = ["div"];
+  var el = tempDoc.body.querySelector("#el");
+  t.equal(
+    contains(tempDoc, selectors, el),
+    true,
+    "contains() returns true when a selector contains the element"
+  );
+
+  selectors = ["span"];
+  t.equal(
+    contains(tempDoc, selectors, el),
+    false,
+    "contains() returns false when the selectors do not contain the element"
+  );
+
+  t.end();
+});
diff --git a/tests/lib/util/extend.js b/tests/lib/util/extend.js
new file mode 100644
index 0000000..52bbf68
--- /dev/null
+++ b/tests/lib/util/extend.js
@@ -0,0 +1,25 @@
+var tape = require("tape");
+
+var extend = require("../../../lib/util/extend");
+
+tape("test extend method", function(t) {
+  var obj = { one: 1, two: 2 };
+
+  var extended = extend({}, obj, { two: "two", three: 3 });
+  t.notEqual(obj, extended, "extended object isn't the original object");
+  t.notSame(
+    obj,
+    extended,
+    "extended object doesn't have the same values as original object"
+  );
+  t.notSame(
+    obj.two,
+    extended.two,
+    "extended object value overwrites value from original object"
+  );
+
+  extended = extend(null);
+  t.equals(extended, null, "passing null returns null");
+
+  t.end();
+});
diff --git a/tests/lib/util/noop.js b/tests/lib/util/noop.js
new file mode 100644
index 0000000..aabb080
--- /dev/null
+++ b/tests/lib/util/noop.js
@@ -0,0 +1,9 @@
+var tape = require("tape");
+
+var noop = require("../../../lib/util/noop");
+
+tape("test noop function", function(t) {
+  t.equal(typeof noop, "function", "noop is a function");
+  t.equal(noop(), undefined, "noop() returns nothing");
+  t.end();
+});
diff --git a/tests/lib/util/update-query-string.js b/tests/lib/util/update-query-string.js
new file mode 100644
index 0000000..026f03a
--- /dev/null
+++ b/tests/lib/util/update-query-string.js
@@ -0,0 +1,33 @@
+var tape = require("tape");
+
+var updateQueryString = require("../../../lib/util/update-query-string");
+
+tape("test update query string method", function(t) {
+  var url = "http://example.com";
+  var updatedUrl = updateQueryString(url, "foo", "bar");
+
+  t.notEqual(url, updatedUrl, "update query string modifies URL");
+  t.equal(
+    updatedUrl,
+    url + "?foo=bar",
+    "update query string creates new query string when no query string params are set"
+  );
+
+  updatedUrl = updateQueryString(updatedUrl, "foo", "baz");
+
+  t.equal(
+    updatedUrl,
+    url + "?foo=baz",
+    "update query string updates existing query string param"
+  );
+
+  updatedUrl = updateQueryString(updatedUrl, "bar", "");
+
+  t.equal(
+    updatedUrl,
+    url + "?foo=baz&bar=",
+    "update query string appends to existing query string"
+  );
+
+  t.end();
+});
diff --git a/tests/setup.js b/tests/setup.js
new file mode 100644
index 0000000..f8c78c2
--- /dev/null
+++ b/tests/setup.js
@@ -0,0 +1,6 @@
+var jsdomOptions = {
+  url: "https://example.org/",
+  runScripts: "dangerously"
+};
+
+require("jsdom-global")("", jsdomOptions);
diff --git a/tests/test.ts b/tests/test.ts
new file mode 100644
index 0000000..4d76ad4
--- /dev/null
+++ b/tests/test.ts
@@ -0,0 +1,41 @@
+import Pjax = require("../index");
+
+let options: Pjax.IOptions = {
+  elements: "a.pjax, form.pjax",
+  selectors: ["div.pjax"],
+  switches: {
+    "a.pjax": (oldEl, newEl) => {
+      oldEl.parentNode.replaceChild(newEl, oldEl);
+      this.onSwitch();
+    },
+    "form.pjax": Pjax.switches.innerHTML
+  },
+  switchesOptions: {},
+  history: true,
+  analytics: false,
+  scrollTo: 1,
+  scrollRestoration: false,
+  cacheBust: false,
+  debug: true,
+  timeout: 60000,
+  currentUrlFullReload: true
+};
+
+options.analytics = () => {};
+options.scrollTo = [1, 1];
+options.scrollTo = false;
+
+if (Pjax.isSupported()) {
+  delete options.switchesOptions;
+  const pjax = new Pjax(options);
+
+  pjax.reload();
+  pjax.loadUrl("https://example.org", options);
+
+  pjax._handleResponse = pjax.handleResponse;
+  pjax.handleResponse = (requestText: string, request: XMLHttpRequest, href: string) => {
+    pjax.abortRequest(request);
+
+    return pjax._handleResponse(requestText, request, href);
+  }
+}