The W3C Markup Validation Service

Validation - CRediT validation How it works · HTML form validation is applied via CSS's two pseudo-classes, :invalid and :valid · Bootstrap scopes the :invalid and :valid styles to parent validation validation Definitions: Confirmation, through the provision of objective evidence, that the requirements for a specific intended use or application have

validation Schema validation lets you create validation rules for your fields, such as allowed data types and value ranges MongoDB uses a flexible schema model,