The :valid CSS pseudo-class represents any <input> or <form> element whose content validates correctly according to the input's type setting. This allows to easily make valid fields adopt an appearance that helps the user confirm that their data is formatted properly.


This example presents a simple form that colors elements green when they validate and red when they don't.

HTML Content

  <label>Enter a URL:</label>
  <input type="url" />
  <br />
  <br />
  <label>Enter an email address:</label>
  <input type="email" required/>

CSS Content

input:invalid {
  background-color: #ffdddd;

form:invalid {
  border: 5px solid #ffdddd;

input:valid {
  background-color: #ddffdd;

form:valid {
  border: 5px solid #ddffdd;
input:required {
  border-color: #800000;
  border-width: 3px;


Specification Status Comment
WHATWG HTML Living Standard
The definition of ':valid' in that specification.
Living Standard No change.
The definition of ':valid' in that specification.
Recommendation Defines the semantic regarding HTML and constraint validation.
Selectors Level 4
The definition of ':valid' in that specification.
Working Draft No change.
CSS Basic User Interface Module Level 3
The definition of ':valid' 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

 Contributors to this page: fscholz, teoli, Inkbug, MusikAnimal, kscarfone, Sheppy, McGurk, nimbupani, jswisher
 Last updated by: fscholz,