Re: [whatwg/webidl] Normative: Add DOMException cause (PR #1179)

@legendecas commented on this pull request.



>  constructor steps are:
 
-1. Set [=this=]'s [=DOMException/name=] to |name|.
-1. Set [=this=]'s [=DOMException/message=] to |message|.
+1.  Set [=this=]'s [=DOMException/message=] to |message|.
+1.  If |options| is a string, then set [=this=]'s [=DOMException/name=] to |options|.
+1.  Otherwise,
+    1.  Set [=this=]'s [=DOMException/name=] to |options|["{{DOMExceptionOptions/name}}"].
+    1.  Perform [=?=] <a abstract-op>InstallErrorCause</a>([=this=], |options|).

Thank you for the suggestion!

AFAICT, `O` is not defined in this context. Should we perform abstract-op CreateNonEnumerableDataPropertyOrThrow on `[=this=]` instead? I'm not sure if `[=this=]` here refers to the WebIDL type or the JavaScript `this` 😅

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