The :indeterminate CSS pseudo-class selects any form element whose state is indeterminate.

/* Selects any <input>, but only when its state is indeterminate  */
input:indeterminate {
  background: lime;

This includes:

  • any <input type="checkbox"> element whose indeterminate DOM property is set to true by JavaScript.
  • <input type="radio"> elements whose radio button group's radio buttons are all unchecked.
  • <progress> elements in an indeterminate state.




Checkbox & radio button


input, span {
  background: red;

:indeterminate, :indeterminate + label {
  background: lime;


  <input type="checkbox" id="checkbox">
  <label for="checkbox">Background should be green</label>
  <input type="radio" id="radio">
  <label for="radio">Background should be green</label>


var inputs = document.getElementsByTagName("input");
for(var i = 0; i < inputs.length; i++) {
  inputs[i].indeterminate = true;

Progress element


:indeterminate {
  opacity: 0.5;





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

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Edge Opera Safari
type="checkbox" (Yes) 3.6 (1.9.2) 9.0 (Yes) 10.60 (2.6) 3.0
<progress> 6.0 6.0 (6.0) 10 (Yes) ? 5.2
type="radio" 39.0 51 (51)[1] No support No support[2] ? No support[3]
Feature Android Firefox Mobile (Gecko) IE Mobile Edge Opera Mobile Safari Mobile
type="checkbox" ? 1.0 (1.9.2) ? (Yes) ? ?
<progress> ? 6.0 (6.0) ? (Yes) ? ?
type="radio" 39.0 51.0 (51.0)[1] No support No support[2] ? No support[3]

[1] Implemented in bug 885359.

[2] See Edge bug 7124038

[3] See WebKit bug 156270

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