Summary
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.
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 | 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
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Contributors to this page:
fscholz,
MusikAnimal,
kscarfone,
Sheppy,
teoli,
FredB,
McGurk,
berkerpeksag,
nimbupani
Last updated by:
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