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.




Not part of any specification..

Only certain CSS properties can be applied to ::-ms-fill. Any properties other than the following will be ignored:

Indeterminate progress bars and animation-name

By default in Internet Explorer, indeterminate <progress> elements display a moving dots animation. (Indeterminate <progress> elements are ones that don't have a value attribute set, and can be selected with the :indeterminate pseudo-class.)

By setting animation-name on ::-ms-fill, you can change the animation:

Value Description
none Turns off the animation so that no dots are displayed.
-ms-bar Shows animated dots that flow in a bar pattern.
-ms-ring Shows animated dots that flow in a ring pattern.



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


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


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

Progress Bar with Orange Fill

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 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

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 Last updated by: Tigt,