From 97a33c957217acb7f1e3dae809558897d20952c2 Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Wed, 27 Oct 2021 15:13:13 -0400
Subject: [PATCH] Fix test for stylesheet presence

Related commit:
- https://github.com/gorhill/uBlock/commit/4f923384de152fafaa52df8fa3e282cbe3db8659
---
 src/js/static-filtering-parser.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/js/static-filtering-parser.js b/src/js/static-filtering-parser.js
index c22d01b26..1a477314e 100644
--- a/src/js/static-filtering-parser.js
+++ b/src/js/static-filtering-parser.js
@@ -1442,13 +1442,16 @@ Parser.prototype.SelectorCompiler = class {
     // https://github.com/gorhill/uBlock/issues/3111
     //   Workaround until https://bugzilla.mozilla.org/show_bug.cgi?id=1406817
     //   is fixed.
+    // https://github.com/uBlockOrigin/uBlock-issues/issues/1751
+    //   Do not rely on matches() or querySelector() to test whether a
+    //   selector is declarative or not.
     cssSelectorType(s) {
         if ( this.reSimpleSelector.test(s) ) { return 1; }
         const pos = this.cssPseudoElement(s);
         if ( pos !== -1 ) {
             return this.cssSelectorType(s.slice(0, pos)) === 1 ? 3 : 0;
         }
-        if ( this.div === null ) { return 1; }
+        if ( this.stylesheet === null ) { return 1; }
         try {
             this.stylesheet.insertRule(`${s}{color:red}`);
             if ( this.stylesheet.cssRules.length === 0 ) { return 0; }