Consistently use toLowerCase in tag name comparisons. #1001
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Currently, we use the native
DOMParser
for HTML deserialization in browser environments, while recommendingparse5
for server-side rendering or node environments. TheDOMParser
implements the DOM spec which returns uppercase tag names, whileparse5
implements the more low-level HTML spec and ends up returning lowercase tag names (it's a little more nuanced but that's the TL;DR, see this issue for the full discussion). Because of this discrepancy, for the time being we should consistently use & recommend case-insensitive comparisons of tag names to prevent potential environment-specific bugs and confusion. (Currently we useDOMParser
-compatible CAPS tags in some documentation/examples while usingtoLowerCase
elsewhere.)