added marker in the list of ignored pseudo elements

lib/single-file/modules/css-matched-rules.js

@@ -26,7 +26,7 @@ this.singlefile.lib.modules.matchedRules = this.singlefile.lib.modules.matchedRu
 	const singlefile = this.singlefile;
 
 	const MEDIA_ALL = "all";
-	const IGNORED_PSEUDO_ELEMENTS = ["after", "before", "first-letter", "first-line", "placeholder", "selection", "part"];
+	const IGNORED_PSEUDO_ELEMENTS = ["after", "before", "first-letter", "first-line", "placeholder", "selection", "part", "marker"];
 	const SINGLE_FILE_HIDDEN_CLASS_NAME = "sf-hidden";
 	const DISPLAY_STYLE = "display";
 	const REGEXP_VENDOR_IDENTIFIER = /-(ms|webkit|moz|o)-/;