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Expose form control constraint validation - #604
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This was referenced Sep 19, 2026
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Closes #603. Advances #257.
This exposes live SameObject
ValidityState, all eleven validity flags, validation messages,willValidate, custom validity,checkValidity, andreportValidityon the supported controls. Failed validation dispatches a cancelable non-bubblinginvalidevent, while custom-error changes recascade:valid/:invalidonly when selector state changes. Generated bindings and focused browser/native/profile contracts are included.Form/fieldset aggregation, submission-time validation and interactive validation UI remain separate work.
Validation:
git diff --cached --checkpassed. Builds, WPT, benchmarks, product acceptance and computer-use remain deferred.