[css-pseudo-4] Prefixed properties don't apply to highlights. #7580

Author: fantasai

css-pseudo-4/Overview.bs

@@ -952,6 +952,9 @@ Styling Highlights</h3>
   into a single shape.
 -->
 
+  Vendor-prefixed properties such as '-webkit-text-fill-color'
+  are not applicable to the [=highlight pseudo-elements=].
+  <!-- https://github.com/w3c/csswg-drafts/issues/7580 -->
 
 <h3 id=highlight-ua-styles>
 Default UA Styles</h3>