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Html required validation still not working for radios element [#2996916] | Drupal.org
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Radios element missing "required" attribute [#2951317] | Drupal.org
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aria-required attribute on input[type="radio"] is invalid in ARIA [#3213292] | Drupal.org
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Radios element missing "required" attribute [#2951317] | Drupal.org
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