This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The ::-moz-range-progress CSS pseudo-element is a Mozilla extension that represents the lower portion of the track (i.e., groove) in which the indicator slides in an <input> of type="range". This portion corresponds to values lower than the value currently selected by the thumb (i.e., virtual knob).

Note: Using ::-moz-range-progress with anything but an <input type="range"> doesn't match anything and has no effect.





<input type="range" min="0" max="100" step="5" value="50"/>


input[type=range]::-moz-range-progress {
  background-color: green;
  height: 1em;


A progress bar using this style might look something like this:


Not part of any specification. This is a proprietary pseudo-element specific to Gecko.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Firefox (Gecko) Chrome Internet Explorer Opera Safari
Basic support (Yes) No support No support No support No support
Feature Firefox Mobile (Gecko) Android IE Phone Opera Mobile Safari Mobile
Basic support (Yes) No support No support No support No support

See also

Document Tags and Contributors

 Contributors to this page: mfluehr, Sebastianz, cvrebert, teoli
 Last updated by: mfluehr,