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

@fred-wang commented on this pull request.



> @@ -6519,6 +6529,11 @@ string <var>namespace</var> (default null):</p>
 
  <li><p>If <var>oldAttr</var> is <var>attr</var>, return <var>attr</var>.
 
+ <li><p>Let <var>verifiedValue</var> be the result of calling <a>verify attribute value</a>
+ <var>attr</var>'s <a for=Attr>value</a> for <var>attr</var>, with <var>element</var>.
+
+ <li><p>Set <var>attr</var>'s <a for=Attr>value</a> to <var>verifiedValue</var>.
+

FWIW, in https://bugzilla.mozilla.org/show_bug.cgi?id=1944511 I'm adding new tests and will try to make sure this case and the other ones mentioned below are covered.

But my guess would be we should just throw the same exception as in step 1 in that case:

> 1 If attr’s [element](https://dom.spec.whatwg.org/#concept-attribute-element) is neither null nor element, [throw](https://webidl.spec.whatwg.org/#dfn-throw) an "[InUseAttributeError](https://webidl.spec.whatwg.org/#inuseattributeerror)" [DOMException](https://webidl.spec.whatwg.org/#idl-DOMException).


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