5 docs tagged with "validation"

Enforce exact string formats like zip codes or custom IDs using the pattern attribute paired with regular expressions (RegEx).

Learn how to mark critical form inputs as mandatory using the required boolean attribute to prevent empty form submissions.

Explore client-side native HTML validation rules, automatic constraint checks, validation UI popups, and pseudo-class styling hooks.

Establish lower and upper bound thresholds for numeric, range, and date/time inputs using min and max attributes.

Restrict minimum and maximum character counts in text fields and textareas using minlength and maxlength attributes.