[Bug 23189] New: Better defaults for #observe options

https://www.w3.org/Bugs/Public/show_bug.cgi?id=23189

            Bug ID: 23189
           Summary: Better defaults for #observe options
           Product: WebAppsWG
           Version: unspecified
          Hardware: PC
                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/#interface-mutationobserver

[[
If attributeOldValue is true and attributes is not true, throw a "SyntaxError".

If attributeFilter is a non-empty array and attributes is not true, throw a
"SyntaxError".

If characterDataOldValue is true and characterData is not true, throw a
"SyntaxError". 
]]

Why not consider that attributes is automatically set to true for the first
two, and likewise characterData for the third? It's certainly what the
developer meant, and it's less typing.

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