Re: [dom] setAttributeNode should not change order of existing attributes (#116)

When I filed this bug I was thinking of the difficulty of getting this fixed in three browser engines, but setAttributeNode and many other attribute-related methods need to be changed to get the case sensitivity in line with the spec, so perhaps this is a small concern in comparison.

As for complexity, it looks like it doesn't matter much either way in Blink, so if replacing is actually a complication for Gecko and if it doesn't sit too well with the spec, then I just might change my mind on this. If so we should ask WebKit and Edge folks if they see any problem.

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