CSS - :invalid

The :invalid CSS pseudo-class represents any <input> or <form> element whose content fails to validate according to the input's type setting. This allows you to easily have invalid fields adopt an appearance that helps the user identify and correct errors.

Syntax  

:invalid { style properties }

Description  

The :invalid CSS pseudo-class represents any <input> or <form> element whose content fails to validate according to the input's type setting. This allows you to easily have invalid fields adopt an appearance that helps the user identify and correct errors.

By default, Gecko does not apply a style to the :invalid pseudo-class. However it does apply a style (a red "glow" using the box-shadow property) to the :-moz-ui-invalid pseudo-class, which applies in a subset of cases for :invalid.

You can disable the glow using the following CSS, or completely override it to alter the appearance of invalid fields.

:invalid {
  box-shadow: none;
}

:-moz-submit-invalid {
  box-shadow: none;
}

:-moz-ui-invalid {
  box-shadow:none;
}

Browser Compatibility  

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

Notes  

Radio buttons

If any of the radio buttons in a group (that is, with the same value for their name attribute) is required, the :invalid pseudo-class is applied to all of them if none of the buttons in the group are selected.

See Also  

Specifications  

Specification Status Comment
WHATWG HTML Living Standard
The definition of ':invalid' in that specification.
Living Standard No change.
HTML5
The definition of ':invalid' in that specification.
Recommendation Defines the semantic regarding HTML and constraint validation.
Selectors Level 4
The definition of ':invalid' in that specification.
Working Draft No change.
CSS Basic User Interface Module Level 3
The definition of ':invalid' in that specification.
Candidate Recommendation Defines the pseudo-class, but not the associated semantic.

Example

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

HTML Content

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

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;
}

input:required:invalid {
  border-color: #C00000;
}

License

© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-us/docs/web/css/:invalid