[Bug 23705] New: MutationObserver observe option validation does not match implementations

https://www.w3.org/Bugs/Public/show_bug.cgi?id=23705

            Bug ID: 23705
           Summary: MutationObserver observe option validation does not
                    match implementations
           Product: WebAppsWG
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DOM
          Assignee: [email protected]
          Reporter: [email protected]
        QA Contact: [email protected]
                CC: [email protected], [email protected]

http://dom.spec.whatwg.org/#dom-mutationobserver-observe

Given:

  observe(node, {attributeOldValue: true})

now in step 1 `attributes` gets set to true, therefore making 3 no longer
throw. This does not match WebKit/Blink, Gecko nor IE.

Removing step 1 and 2 seems to match implementations better.

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