Re: [whatwg/webidl] Allow DOMException subclasses to be used as exceptions (PR #1211)

@jan-ivar commented on this pull request.



> +    constructor dictionary, which return the values accepted by the constructor operation.
+*   They should be [=serializable objects=], whose [=serialization steps=] and
+    [=deserialization steps=] preserve the additional information.
+
+<p class=note>These requirements mean that the inherited {{DOMException/code}} property of these
+interfaces will always return 0.
+
+<div class=example id=example-domexception-derived-interface>
+    The definition for a {{DOMException}} derived interface which carries along an additional
+    "protocol error code", which is derived from what the server sent over some some hypothetical
+    network protocol "protocol X", could look something like this:
+
+    <pre highlight=webidl>
+        [Exposed=Window, Serializable]
+        interface ProtocolXError : DOMException {
+          constructor(optional DOMString message = "", ProtocolXErrorOptions options);

```suggestion
          constructor(optional DOMString message = "", optional ProtocolXErrorOptions options);
```

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