The spec doesn't have either [Throws] nor ?, and we have both. Currently we never return null.
It can throw because of forwarding to inner. Which for WebIDL is somewhat of a non-issue from script, because that never has an outer once it's gone through the bindings.... We really need to finish splitting inners and outers and only put the WebIDL bits on the inner. But the nullable bit can obviously go away.
https://bugzilla.mozilla.org/show_bug.cgi?id=1472046 Move all DOM bugs that haven’t been updated in more than 3 years and has no one currently assigned to P5. If you have questions, please contact :mdaly.
Priority: -- → P5
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