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

@annevk 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]]

Perhaps it makes more sense to return null in that case. Having something return an Infra string, an ES value (that's always the input value), or throw is a tad confusing.

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