From e07e7bbd094bb8e671f061161932a749dd194c2a Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Fri, 18 Jul 2025 10:23:11 -0400
Subject: [PATCH] Fix potential exception in procedural operator
 `:matches-attr`

Related issue:
https://github.com/uBlockOrigin/uBlock-issues/issues/3720
---
 platform/mv3/extension/js/scripting/css-procedural-api.js | 1 +
 src/js/contentscript-extra.js                             | 1 +
 2 files changed, 2 insertions(+)

diff --git a/platform/mv3/extension/js/scripting/css-procedural-api.js b/platform/mv3/extension/js/scripting/css-procedural-api.js
index 4b516271f..1446cdf7c 100644
--- a/platform/mv3/extension/js/scripting/css-procedural-api.js
+++ b/platform/mv3/extension/js/scripting/css-procedural-api.js
@@ -119,6 +119,7 @@ class PSelectorMatchesAttrTask extends PSelectorTask {
         this.reValue = regexFromString(task[1].value, true);
     }
     transpose(node, output) {
+        if ( typeof node.getAttributeNames !== 'function' ) { return; }
         const attrs = node.getAttributeNames();
         for ( const attr of attrs ) {
             if ( this.reAttr.test(attr) === false ) { continue; }
diff --git a/src/js/contentscript-extra.js b/src/js/contentscript-extra.js
index 9a60dabf7..cb056c30f 100644
--- a/src/js/contentscript-extra.js
+++ b/src/js/contentscript-extra.js
@@ -99,6 +99,7 @@ class PSelectorMatchesAttrTask extends PSelectorTask {
         this.reValue = regexFromString(task[1].value, true);
     }
     transpose(node, output) {
+        if ( typeof node.getAttributeNames !== 'function' ) { return; }
         const attrs = node.getAttributeNames();
         for ( const attr of attrs ) {
             if ( this.reAttr.test(attr) === false ) { continue; }