Re: [whatwg/dom] Trusted types attributes (PR #1268)

@lukewarlow commented on this pull request.



> @@ -7382,7 +7437,13 @@ string <var>value</var>, run these steps:
  <li><p>If <var>attribute</var>'s <a for=Attr>element</a> is null, then set <var>attribute</var>'s
  <a for=Attr>value</a> to <var>value</var>.
 
- <li><p>Otherwise, <a lt="change an attribute">change</a> <var>attribute</var> to <var>value</var>.
+ <li><p>Otherwise:
+  <ol>
+    <li><p>Let <var>verifiedValue</var> be the result of calling <a>verify attribute value</a>
+    <var>value</var> for <var>attribute</var>, with <a>this</a>.
+
+   <li><p><a lt="change an attribute">Change</a> <var>attribute</var> to <var>verifiedValue</var>.

Having discussed this with Fred we've got an idea on what to do here. The spec will say that if the element is changed by the TT callback that we early return (perhaps throw in which case we need to decide an exception).

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