MDN’s new design is in Beta! A sneak peek:

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 ::-ms-fill CSS pseudo-element represents the filled-in portion of a <progress> element. This pseudo-element is non-standard and specific to Internet Explorer 10+, hence the vendor prefix.


::-ms-fill { style properties }


Not part of any specification. Microsoft has a description on MSDN.


CSS content

progress::-ms-fill {
  background-color: orange;

HTML content

<progress value="10" max="50">


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

Progress Bar with Orange Fill

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support No support (Yes) No support 10.0 No support No support
Feature Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support No support (Yes) No support ? No support No support

See also

Document Tags and Contributors

 Contributors to this page: erikadoyle, Sebastianz, pkpatel88, cvrebert, Rupshree, teoli, jswisher, mrenty
 Last updated by: erikadoyle,