[Bug 27122] MutationObserver.observe(node, {}) should throw

https://www.w3.org/Bugs/Public/show_bug.cgi?id=27122

--- Comment #7 from Olli Pettay <bugs@pettay.fi> ---
if observe(foo, { ... something...}) doesn't end up doing anything (not observe
any changes), that should throw. Scripts should know asap that something is
going wrong, not wait later to figure out that the expected MutationRecords
won't be there.

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Received on Tuesday, 21 October 2014 20:05:24 UTC