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:optional Redirect 1


The :optional CSS pseudo-class represents any <input> element that does not have the required attribute set on it. This allows forms to easily indicate optional fields, and to style them accordingly.

To provide an appearance for required form fields, the :required pseudo-class may be used.


See :invalid for an example.


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

Last updated by: Sheppy,