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Implement ElementInternals constraint validation - #616
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This was referenced Sep 19, 2026
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Closes #615. Advances #257.
Form-associated custom elements now participate in native constraint validation, selector/form/fieldset aggregation, invalid events, submit/reset user-validity, and bounded retained-state restoration through ElementInternals.
Validation:
git diff --cached --checkpassed. Runtime and product gates remain deferred.