[Bug 24000] New: DOMException should extend ES Error

https://www.w3.org/Bugs/Public/show_bug.cgi?id=24000

            Bug ID: 24000
           Summary: DOMException should extend ES Error
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                OS: Windows 3.1
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DOM
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected], [email protected]

To make DOMException Promises friendly, the DOMException IDL definition needs
to extend ES Error. See:
https://github.com/domenic/promises-unwrapping/issues/84

Testing the following:

<script>
try {
    document.body.appendChild(document.body)
} catch (e) {
    alert(e instanceof Error)
}
</script>

The latest versions of Chrome, Safari, and IE return true. FF returns false.

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