Updated Does µBlock blocks ads or just hide them? (markdown)

Does-µBlock-blocks-ads-or-just-hide-them?.md

@@ -18,6 +18,12 @@ The purpose of network filter is to prevent a network request to be made to a re
 
 **Short answer:** resources blocked: network requests are cancelled before they leave the browser.
 
+#### Hosts file
+
+µBlock also support the parsing and enforcing of hosts files -- something which ABP does not. All entries in a hosts file are parsed as network filters, i.e. no resource will be fetch from a remote server which appear in a hosts file, no connection will even be attempted.
+
+**Short answer:** resources blocked: network requests are cancelled before they leave the browser.
+
 #### Cosmetic filters
 
 These filters serve to remove DOM elements from a web page. They have no value privacy-wise, it is essentially to make web page look better by removing unwanted content, which usually cannot be blocked using network filters. Just like ABP, µBlock will hide DOM elements on a web page which match cosmetic filters. µBlock uses a [different method](https://github.com/gorhill/uBlock/wiki/Cosmetic-filtering-in-%C2%B5Block:-version-0.4.0.0-update) than other big-name blockers to hide the DOM elements though.
@@ -25,14 +31,17 @@ These filters serve to remove DOM elements from a web page. They have no value p
 Different classes of cosmetic filters are applied differently:
 
 - Specific cosmetic filters: injected before page's root DOM is loaded
+    - No flickering
 - Generic cosmetic filters: injected after page's root DOM is loaded
     - These are cacheable
+    - Since these cosmetic filters are applied after page load, DOM elements **may** be hidden after they are rendered
+    - Notice the emphasized "may": generally, you won't see this; and sometimes you will notice **more** flickering with ABP (with same filter lists):
+    - Demonstration: [test page](http://raymondhill.net/ublock/tiles1.html)
+        - Chromium + uBlock: minimal flickering
+        - Chromium + ABP: noticeable flickering
+        - Firefox + uBlock: no flickering
+        - Firefox + ABP: no flickering
 - Cached generic cosmetic filters: injected before page's root DOM is loaded
+    - No flickering
 
 **Short answer:** resources hidden -- in various ways depending on the class of cosmetic filters.
-
-#### Hosts file
-
-µBlock also support the parsing and enforcing of hosts files -- something which ABP does not. All entries in a hosts file are parsed as network filters, i.e. no resource will be fetch from a remote server which appear in a hosts file, no connection will even be attempted.
-
-**Short answer:** resources blocked: network requests are cancelled before they leave the browser.