Re: [whatwg/webidl] Added a definition of {{StringContext}} extended attribute. (#841)

@Ms2ger commented on this pull request.



> @@ -11056,6 +11100,21 @@ allowed.  The security check takes the following three inputs:
 
 Note: The HTML Standard defines how a security check is performed. [[!HTML]]
 
+Certain algorithms in [[#es-type-mapping]] 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 String value, or [=ECMAScript/throws=] a {{ECMAScript/TypeError}}.

Note that https://w3c.github.io/trusted-types/dist/spec/#html-validate-the-string-in-context doesn't necessarily return a string, and if it did, the conversion algorithm above does some unnecessary work.

> +        [=this=], |V|, the {{StringContext}} extended attribute [=identifier=], and the [=identifier=]
+        of the [{{StringContext}}] extended attribute [=related construct=].

I agree that this doesn't work with the layering as it currently exists.

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