Fix parsing of class names like 'w-1/3' as used in selectors like '.w-1\/3'

composer.json

@@ -17,7 +17,7 @@
     "ampproject/optimizer": "^1",
     "cweagans/composer-patches": "1.6.7",
     "fasterimage/fasterimage": "1.5.0",
-    "sabberworm/php-css-parser": "dev-master#134f4e6"
+    "sabberworm/php-css-parser": "dev-master#bc6ec74"
   },
   "require-dev": {
     "civicrm/composer-downloads-plugin": "^2.1",
@@ -50,9 +50,8 @@
     },
     "patches": {
       "sabberworm/php-css-parser": {
-        "Fix parsing CSS selectors which contain commas <https://github.com/sabberworm/PHP-CSS-Parser/pull/138>": "https://github.com/sabberworm/PHP-CSS-Parser/commit/fa139f65c5b098ae652c970b25e6eb03fc495eb4.diff",
-        "Fix validation of selectors": "patches/php-css-parser-138-extended.patch",
-        "Validate name-start code points for identifier <https://github.com/sabberworm/PHP-CSS-Parser/pull/185>": "patches/php-css-parser-pull-185.patch"
+        "Validate name-start code points for identifier <https://github.com/sabberworm/PHP-CSS-Parser/pull/185>": "patches/php-css-parser-pull-185.patch",
+        "Fix parsing CSS selectors which contain commas <https://github.com/westonruter/PHP-CSS-Parser/pull/1>": "patches/php-css-parser-commit-10a2501.patch"
       }
     }
   },

includes/sanitizers/class-amp-style-sanitizer.php

@@ -1498,7 +1498,7 @@ private function get_parsed_stylesheet( $stylesheet, $options = [] ) {
 		$parsed         = null;
 		$cache_key      = null;
 		$cached         = true;
-		$cache_group    = 'amp-parsed-stylesheet-v27'; // This should be bumped whenever the PHP-CSS-Parser is updated or parsed format is updated.
+		$cache_group    = 'amp-parsed-stylesheet-v28'; // This should be bumped whenever the PHP-CSS-Parser is updated or parsed format is updated.
 		$use_transients = $this->should_use_transient_caching();
 
 		$cache_impacting_options = array_merge(