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Diffstat (limited to 'browser/actors/FormValidationChild.sys.mjs')
| -rw-r--r-- | browser/actors/FormValidationChild.sys.mjs | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/browser/actors/FormValidationChild.sys.mjs b/browser/actors/FormValidationChild.sys.mjs index 6fa2e3c90d..f5ce427d03 100644 --- a/browser/actors/FormValidationChild.sys.mjs +++ b/browser/actors/FormValidationChild.sys.mjs @@ -73,7 +73,11 @@ export class FormValidationChild extends JSWindowActorChild { if (element.isFormAssociatedCustomElements) { // For element that are form-associated custom elements, user agents // should use their validation anchor instead. - element = element.internals.validationAnchor; + // It is not clear how constraint validation should work for FACE in + // spec if the validation anchor is null, see + // https://github.com/whatwg/html/issues/10155. Blink seems fallback to + // FACE itself when validation anchor is null, which looks reasonable. + element = element.internals.validationAnchor || element; } if (!element || !Services.focus.elementIsFocusable(element, 0)) { |