The :optional CSS pseudo-class represents any <input>, <select>, or <textarea> element that does not have the required attribute set on it.

/* Selects any optional <input> */
input:optional {
  border: 1px dashed black;
}

This pseudo-class is useful for styling fields that are not required to submit a form.

Note: The :required pseudo-class selects required form fields.

Syntax

:optional

Examples

See :invalid for an example.

Specifications

Specification Status Comment
HTML Living Standard
The definition of ':optional' in that specification.
Living Standard No change.
HTML5
The definition of ':optional' in that specification.
Recommendation Defines the semantics of HTML and constraint validation.
Selectors Level 4
The definition of ':optional' in that specification.
Working Draft No change.
CSS Basic User Interface Module Level 3
The definition of ':optional' in that specification.
Candidate Recommendation Defines the pseudo-class, but not the associated semantics.

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support 10.0 (Yes) 4.0 (2) 10 10.0 5.0
Feature Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support 4.4 (Yes) 4.0 (2) No support 10.0 5.0

See also

Document Tags and Contributors

 Last updated by: mfluehr,