Selectors: attr name in any NS on HTML elements are case-insensitive

Fixes whatwg#2694

source

@@ -67951,7 +67951,7 @@ contradict people?
   <!-- https://software.hixie.ch/utilities/js/live-dom-viewer/?saved=2623 -->
 
   <p>When comparing the name part of a CSS <span>attribute selector</span> to the names of
-  namespace-less attributes on <span>HTML elements</span> in <span>HTML documents</span>, the name
+  attributes on <span>HTML elements</span> in <span>HTML documents</span>, the name
   part of the CSS <span>attribute selector</span> must first be <span>converted to ASCII
   lowercase</span>. The same selector when compared to other attributes must be compared according
   to its original case. In both cases, the comparison is <span>case-sensitive</span>.</p>