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:valid

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.

Syntax

:valid

Examples

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:

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

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.

Specifications

Specification Status Comment
HTML Living Standard
The definition of ':valid' in that specification.
Living Standard No change.
HTML5
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 compatibilityUpdate compatibility data on GitHub

Desktop
Chrome Edge Firefox Internet Explorer Opera Safari
:valid 10 12 4 10 10 5
Applies to <form> elements 40 79 13 No 27 9
Mobile
Android webview Chrome for Android Firefox for Android Opera for Android Safari on iOS Samsung Internet
:valid 37 18 4 10.1 5 1.0
Applies to <form> elements 40 40 14 27 9 4.0

See also

© 2005–2020 Mozilla and individual contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/:valid