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 represents the portion of the "track" (the groove in which the indicator aka thumb slides) of an <input> of type="range", which corresponds to values lower than the value currently selected by the thumb.

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


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


<input type="range" min="0" max="100" step="5" value="50"/>
input[type=range]::-moz-range-progress {
  height: 1em;

leads to:

Browser compatibility

Feature Firefox (Gecko) Chrome Internet Explorer Opera Safari
Basic support (Yes) Not supported Not supported Not supported Not supported
Feature Firefox Mobile (Gecko) Android IE Phone Opera Mobile Safari Mobile
Basic support (Yes) Not supported Not supported Not supported Not supported

See also

Document Tags and Contributors

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