:optional
: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
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
© 2005–2017 Mozilla Developer Network and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/:optional