Set attr's value to verifiedValue before attribute change steps are fired.

Author: lukewarlow

dom.bs

@@ -7015,13 +7015,13 @@ string <var>namespace</var> (default null):</p>
 
  <li><p>If <var>oldAttr</var> is <var>attr</var>, return <var>attr</var>.
 
+ <li><p>Set <var>attr</var>'s <a for=Attr>value</a> to <var>verifiedValue</var>.
+
  <li><p>If <var>oldAttr</var> is non-null, then <a lt="replace an attribute">replace</a>
  <var>oldAttr</var> with <var>attr</var>.
 
  <li><p>Otherwise, <a lt="append an attribute">append</a> <var>attr</var> to <var>element</var>.
 
- <li><p>Set <var>attr</var>'s <a for=Attr>value</a> to <var>verifiedValue</var>.
-
  <li><p>Return <var>oldAttr</var>.
 </ol>
 </div>