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.
:optional
See :invalid for an example.
| 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. | Proposed Recommendation | Defines the pseudo-class, but not the associated semantics. |
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 10 | Yes | 4 | 10 | 10 | 5 |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support | ? | 4.4 | Yes | 4 | 10 | 5 | ? |
:required, :invalid, :valid
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https://developer.mozilla.org/en-US/docs/Web/CSS/:optional