optional property CSS Reference

Definition and Usage

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.


Desktop browsers

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 10.0 4.0 (2) 10 10.0 5.0

Mobile browsers

Feature Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support NA 4.0 (2) Not supported 10.0 5.0

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