:optional

The :optional CSS pseudo-class represents any <input> or <textarea> 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.

Syntax

:optional { style properties }

Examples

See :invalid for an example.

Specifications

Specification	Status	Comment
WHATWG 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 semantic regarding 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 semantic.

Browser compatibility

See also

• :required
• :invalid
• :valid