:required

Summary

The :required CSS pseudo-class represents any <input> element that has the required attribute set on it. This allows forms to easily indicate which fields must have valid data before the form can be submitted.

The :optional pseudo-class may be used to provide an appearance for optional form fields.

Examples

See :invalid for an example.

Specifications

Specification Status Comment
WHATWG HTML Living Standard Living Standard No change.
HTML5 Candidate Recommendation Defines the semantic regarding HTML and constraint validation.
Selectors Level 4 Working Draft No change.
CSS Basic User Interface Module Level 3 Working Draft Defines the pseudo-class, but not the associated semantic.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 10.0 4.0 (2) 10 10.0 5.0
Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? 4.0 (2) Not supported 10.0 5.0

See also

Document Tags and Contributors

Contributors to this page: Sheppy, teoli, nimbupani, kscarfone, FredB, McGurk
Last updated by: kscarfone,
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