Select Field HTML 5 Validation
Radio Field HTML 5 Validation
Checkbox Field HTML 5 Validation

This module providing HTML 5 validation for Select, Radio, and Checkbox field types. When these field types are required. This module helps those people they are using core HTML 5 validation in his/her projects.

When you installed a fresh Drupal 8 Setup. Core Drupal 8 is not providing HMTL 5 validation for Select, Radio, and Checkbox field types. After installing this module. Your problem will solve. This module automatically will add HTML 5 Validation for Select list (box), Radio, and Checkbox field types.

Learn more why HTML5 validation is bad here: https://www.drupal.org/node/1797438

Install it like any other module
composer require drupal/s_r_c_html5_validation

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