fix: improve element class attribute behaviour #10856
Merged
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This PR does two things:
dom.className
as a string, when it's really an object in the form ofSVGAnimatedString
. Instead we use a dedicated SVG class name path that is better optimized for this case.class
if the value is nullish then we remove the attribute, otherwise we keep it and make it empty. This seems to have a big performance impact, where removing the attribute is causing additional reflows vs just changing it to an empty string.