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http://dom.spec.whatwg.org/#concept-node-insert steps 2 and 3 should only happen if 'child' is not null trivial, but step 7 is explicit about what to do when 'child' is null
Should I attribute this to Warren He?
https://github.com/whatwg/dom/commit/66cf6b6e37544dddc0de0124d9c358cc0fbe9ab6
(In reply to Anne from comment #1) > Should I attribute this to Warren He? why that would be lovely
https://github.com/whatwg/dom/commit/01a520c4d3703839d2983185a72b56b3965ff7b7