From 38bde79146be8f697693dc0eb16b5b9c168f9dd4 Mon Sep 17 00:00:00 2001
From: Raymond Hill <rhill@raymondhill.net>
Date: Mon, 25 Dec 2023 09:06:42 -0500
Subject: [PATCH] Use `CSS.supports()` to detect support of native `:has()`

Related issue:
https://github.com/uBlockOrigin/uBlock-issues/issues/2480#issuecomment-1868595930
---
 platform/common/vapi-common.js | 44 ++++++++++++----------------------
 1 file changed, 15 insertions(+), 29 deletions(-)

diff --git a/platform/common/vapi-common.js b/platform/common/vapi-common.js
index 4296f8563..3b7482074 100644
--- a/platform/common/vapi-common.js
+++ b/platform/common/vapi-common.js
@@ -178,38 +178,24 @@ vAPI.webextFlavor = {
         soup.add('mobile');
     }
 
-    // Asynchronous
-    if (
-        browser instanceof Object &&
-        typeof browser.runtime.getBrowserInfo === 'function'
-    ) {
-        browser.runtime.getBrowserInfo().then(info => {
-            flavor.major = parseInt(info.version, 10) || flavor.major;
-            soup.add(info.vendor.toLowerCase())
-                .add(info.name.toLowerCase());
-            if ( flavor.major >= 121 && soup.has('mobile') === false ) {
-                soup.add('native_css_has');
-            }
-            dispatch();
-        });
-        if ( browser.runtime.getURL('').startsWith('moz-extension://') ) {
-            soup.add('firefox')
-                .add('user_stylesheet')
-                .add('html_filtering');
-            flavor.major = 115;
-        }
-        return;
+    if ( CSS.supports('selector(a:has(b))') ) {
+        soup.add('native_css_has');
     }
 
-    // Synchronous -- order of tests is important
-    const match = /\bChrom(?:e|ium)\/([\d.]+)/.exec(ua);
-    if ( match !== null ) {
-        soup.add('chromium')
-            .add('user_stylesheet');
-        flavor.major = parseInt(match[1], 10) || 0;
-        if ( flavor.major >= 105 ) {
-            soup.add('native_css_has');
+    // Order of tests is important
+    if ( browser.runtime.getURL('').startsWith('moz-extension://') ) {
+        soup.add('firefox')
+            .add('user_stylesheet')
+            .add('html_filtering');
+        const match = /Firefox\/(\d+)/.exec(ua);
+        flavor.major = match && parseInt(match[1], 10) || 115;
+    } else {
+        const match = /\bChrom(?:e|ium)\/(\d+)/.exec(ua);
+        if ( match !== null ) {
+            soup.add('chromium')
+                .add('user_stylesheet');
         }
+        flavor.major = match && parseInt(match[1], 10) || 120;
     }
 
     // Don't starve potential listeners