The :valid CSS pseudo-class represents any <input> or other <form> element whose contents validate successfully. This allows to easily make valid fields adopt an appearance that helps the user confirm that their data is formatted properly.

/* Selects any valid <input> */
input:valid {
  background-color: powderblue;

This pseudo-class is useful for highlighting correct fields for the user.




Indicating valid and invalid form fields

In this example, we use structures like this, which include extra <span>s to generate content on; we'll use these to provide indicators of valid/invalid data:

  <label for="fname">First name *: </label>
  <input id="fname" name="fname" type="text" required>

To provide these indicators, we use the following CSS:

input + span {
  position: relative;

input + span::before {
  position: absolute;
  right: -20px;
  top: 5px;

input:invalid {
  border: 2px solid red;

input:invalid + span::before {
  content: '✖';
  color: red;

input:valid + span::before {
  content: '✓';
  color: green;

We set the <span>s to position: relative so that we can position the generated content relative to them. We then absolutely position different generated content depending on whether the form's data is valid or invalid — a green check or a red cross, respectively. To add a bit of extra urgency to the invalid data, we've also given the inputs a thick red border when invalid.

Note: We've used ::before to add these labels, as we were already using ::after for the "required" labels.

You can try it below:

Notice how the required text inputs are invalid when empty, but valid when they have something filled in. The email input on the other hand is valid when empty, as it is not required, but invalid when it contains something that is not a proper email address.

Accessibility concerns

The color green is commonly used to indicate valid input. People who have certain types of color blindness will be unable to determine the input's state unless it is accompanied by an additional indicator that does not rely on color to convey meaning. Typically, descriptive text and/or an icon are used.


Specification Status Comment
HTML Living Standard
The definition of ':valid' in that specification.
Living Standard No change.
The definition of ':valid' in that specification.
Recommendation Defines the semantics of HTML and constraint validation.
Selectors Level 4
The definition of ':valid' in that specification.
Working Draft Initial definition.

Browser compatibility

ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
:validChrome Full support 10Edge Full support 12Firefox Full support 4IE Full support 10Opera Full support 10Safari Full support 5WebView Android Full support 37Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 10.1Safari iOS Full support 5Samsung Internet Android Full support 1.0
Applies to <form> elementsChrome Full support 40Edge Full support 79Firefox Full support 13IE No support NoOpera Full support 27Safari Full support 9WebView Android Full support 40Chrome Android Full support 40Firefox Android Full support 14Opera Android Full support 27Safari iOS Full support 9Samsung Internet Android Full support 4.0


Full support
Full support
No support
No support

See also