HTML Concepts: Constraint Validation

When a form element has attributes that define requirements for the element’s value, then these requirements—constraints—are being validated by the user agent. On the validation of constraints, validity states, and a link to CSS.


This content originally appeared on Blog (Web Development, Mostly) · Jens Oliver Meiert and was authored by Jens Oliver Meiert

When a form element has attributes that define requirements for the element’s value, then these requirements—constraints—are being validated by the user agent. On the validation of constraints, validity states, and a link to CSS.


This content originally appeared on Blog (Web Development, Mostly) · Jens Oliver Meiert and was authored by Jens Oliver Meiert


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