:optional CSS Pseudo Class
Description
The :optional pseudo-class applies style rules to the <input> element, which does not have the required attribute set; it allows you to select required fields before submitting the form. Thus :optional applies to optional form fields.
Syntax
input:optional { ... }
Example
<p>Please enter your name and age.</p>
<p>Name: <input name="name" required ></p>
<p>Age: <input type="number" name="old"> (Optional)</p>
<p><button>Submit</button></p>input:optional {
border:1px dashed green;
} Browser Support
| Desktop | |||||
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| 10 | 12 | 10 | 4 | 10 | 5 |
| Tablets / Mobile | |||||
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| 37 | 18 | 4 | 10.1 | 5 | Yes |