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=]

Yeah that section specifically is going through a rewrite, Chrome doesn't match it currently and won't in its new form either so that is one change to the chromium implementation that will be needed. (Very minor web facing changes that shouldn't impact anyone)

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