Update files/en-us/web/html/global_attributes/class/index.md

Co-authored-by: Joshua Chen <[email protected]>

files/en-us/web/html/global_attributes/class/index.md

@@ -23,7 +23,7 @@ The `class` attribute is a list of class values separated by [ACSII whitespace](
 
 Each class value may contain any Unicode characters (except, of course, ASCII whitespace). However, when used in CSS selectors, either from JavaScript using APIs like {{domxref("Document.querySelector()")}} or in CSS stylesheets, class attribute values must be valid [CSS identifiers](/en-US/docs/Web/CSS/ident). This means that if a class attribute value is not a valid CSS identifier (for example, `my?class` or `1234`) then it must be escaped before being used in a selector, either using the {{domxref("CSS.escape_static", "CSS.escape()")}} method or [manually](/en-US/docs/Web/CSS/ident#escaping_characters).
 
-For this reason, it's recommended that developers choose values for class attributes that are valid CSS identifiers.
+For this reason, it's recommended that developers choose values for class attributes that are valid CSS identifiers that don't require escaping.
 
 ## Specifications