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.

input:valid {
  background-color: #ddffdd;




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


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


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;

input:required:valid {
  border-color: #008000;


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 Initial definition

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support (<input>) 10.0 20 (12.10240) 4.0 (2) 10 10.0 5.0
Apply it to <form> (Yes) No support 13 (13) No support (Yes) ?
Feature Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? (Yes) 4.0 (2) No support 10.0 5.0
Apply it to <form> ? No support 13.0 (13) No support ? ?

See also

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