PHP Form Validation Tutorial | HTML Form Guide
How to Create a Custom Radio Button - HTML & CSS Tutorial - YouTube
Powerful HTML5 Form Validation Plugin - jQuery DjValidator | Free jQuery Plugins
input type="radio"> - HTML: HyperText Markup Language | MDN
html - How to show all required values in HTML5 tool tip? - Stack Overflow
![Radios element missing "required" attribute [#2951317] | Drupal.org](https://www.drupal.org/files/issues/2018-04-11/2951317-10-too-many-asterisks.png "Radios element missing \"required\" attribute [#2951317] | Drupal.org")
Radios element missing "required" attribute [#2951317] | Drupal.org
![Radios element missing "required" attribute [#2951317] | Drupal.org](https://www.drupal.org/files/issues/2019-07-25/aria-required.png "Radios element missing \"required\" attribute [#2951317] | Drupal.org")
Radios element missing "required" attribute [#2951317] | Drupal.org
html - How to set HTML5 required attribute in Javascript? - Stack Overflow
HTML Required Attribute | 3 Examples of HTML Required Attribute
Error message: "Each of your radio button elements should be added within the form tag." - HTML-CSS - The freeCodeCamp Forum
html - How to change the size of the radio button using CSS? - Stack Overflow
Custom HTML5 Form Validator In Vanilla JavaScript - Just-validate | CSS Script
Extend HTML5 Form Validation With Custom Rules And Errors - Bouncer.js | CSS Script
HTML | DOM Input Radio required Property - GeeksforGeeks
How to check a radio button using JavaScript - javatpoint
Adding Radio Buttons, Checkboxes & Lists for User Input to HTML Forms - Video & Lesson Transcript | Study.com
CSS Style Radio Button: Styling a radio button with only CSS - DEV Community
Html/Elements/input/radio - W3C Wiki
HTML5 & WAI-ARIA Forms with jQuery Validation
HTML Required Not Working: 5 Issues That Cause It
![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
css - Display HTML5 error message/validation on hidden radio/checkbox - Stack Overflow
HTML | <input> required Attribute - GeeksforGeeks
Create a Set of Radio Buttons Free Code Camp Org Basic HTML and HTML5 - YouTube
HTML Forms Tutorial — How to create forms in HTML — TutorialBrain
