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]]

@koto or @otherdaniel do you forsee chrome having any issues with this proposed change? It'd be good to get the specs and webkit implementation.

Tldr drop the IDL extended attribute and just use unions everywhere we need enforcement (updating the call site directly).

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