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

@lukewarlow commented on this pull request.



> @@ -11056,6 +11091,21 @@ allowed.  The security check takes the following three inputs:
 
 Note: The HTML Standard defines how a security check is performed. [[!HTML]]
 
+Certain algorithms are defined to
+<dfn id="dfn-validate-the-string-in-context" export>validate the string in context</dfn> on a given
+value. This check is used to determine whether a given value
+is appropriate for its {{StringContext}}. This validation takes the following four inputs:
+
+1.  the [=platform object=] on
+    which the operation invocation or attribute access is being done,
+1.  the value to validate,
+1.  the {{StringContext}} [=identifier=], and
+1.  the [=identifier=] of the operation or attribute.
+
+The algorithm returns an ECMAScript value, or [=JavaScript/throws=] a <l spec=ecmascript>{{TypeError}}</l>.
+
+Note: The HTML Standard defines how the validation is performed. [[!HTML]]

If it helps the discussion I've got a draft commit to update the WebKIt implementation to use union types instead of IDL magic. This doesn't account for DOM timers (webkit impl is different to spec). But otherwise replaces all existing usages of IDL magic.

https://github.com/webkit/webkit/compare/lukewarlow:trusted-types-use-union-over-attribute

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