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![If radio buttons are required but not filled form is nevertheless submitted [#2856795] | Drupal.org](https://www.drupal.org/files/issues/Screen%20Shot%202017-03-04%20at%205.57.43%20AM.png "If radio buttons are required but not filled form is nevertheless submitted [#2856795] | Drupal.org")
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](https://www.drupal.org/files/issues/Screen%20Shot%202017-06-11%20at%209.14.37%20PM.png "If radio buttons are required but not filled form is nevertheless submitted [#2856795] | Drupal.org")
If radio buttons are required but not filled form is nevertheless submitted [#2856795] | Drupal.org
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HTML | DOM Input Radio required Property - GeeksforGeeks
![If radio buttons are required but not filled form is nevertheless submitted [#2856795] | Drupal.org](https://www.drupal.org/files/issues/Screen%20Shot%202017-03-06%20at%209.23.01%20AM.png "If radio buttons are required but not filled form is nevertheless submitted [#2856795] | Drupal.org")
If radio buttons are required but not filled form is nevertheless submitted [#2856795] | Drupal.org
HTML Required Attribute | 3 Examples of HTML Required Attribute
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PHP Form Validation Tutorial | HTML Form Guide
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