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::-ms-fill

Non-standard
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.

Syntax

::-ms-fill

Specifications

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

Example

HTML

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

CSS

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

Result

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