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Custom element fix #2221
Align custom elements to work just like normal elements, minus our HTML workarounds. Previously, our support has been undocumented and completely untested, but I plan to fix that in a follow-up commit (along with a changelog entry).
Drive-by: add a
Motivation and Context
How Has This Been Tested?
Ran the tests in ospec + Node. Performance changes are within the margin of error, although I made a few size-related optimizations that incidentally reclaimed 33 bytes.
Types of changes