input type="radio"> - HTML: HyperText Markup Language | MDN
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If radio buttons are required but not filled form is nevertheless submitted [#2856795] | Drupal.org
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If radio buttons are required but not filled form is nevertheless submitted [#2856795] | Drupal.org
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Each of your radio button elements should be added within the form tag. pls what is my mistake - HTML-CSS - The freeCodeCamp Forum
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Radios element missing "required" attribute [#2951317] | Drupal.org
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