Re: [whatwg/webidl] Add `{{StringContext}}` extended attribute (PR #1392)

@lukewarlow commented on this pull request.



> @@ -10259,6 +10261,39 @@ that does specify [{{SecureContext}}].
     </pre>
 </div>
 
+<h4 id="StringContext" extended-attribute lt="StringContext">[StringContext]</h4>
+
+If the [{{StringContext}}] [=extended attribute=] appears on {{DOMString}} or {{USVString}}, it
+modifies how the value is converted to the IDL type, causing additional value validation to
+adhere to the context the string is used in.
+
+The [{{StringContext}}] extended attribute must [=takes an identifier|take an identifier=]. The [=identifier=]
+must be one of "<code>TrustedHTML</code>", "<code>TrustedScript</code>", and "<code>TrustedScriptURL</code>".
+
+The [{{StringContext}}] extended attribute may only annotate a type of a [=regular attribute=] or
+a [=regular operation=] argument. A type annotated with the [{{StringContext}}]
+extended attribute must not appear in a [=read only=] attribute.
+
+A type that is not {{DOMString}} or {{USVString}} must not be [=extended attributes associated with|associated with=]

https://github.com/w3c/trusted-types/pull/484 - in this PR the textContent one specifically was updated to use a union. I've done a follow up commit that changes them all to unions (which I can easily revert if we decide against that)

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