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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-upper CSS pseudo-element is a Microsoft extension that represents the upper portion of the track of a slider control; that is, the portion corresponding to values greater than the value currently selected by the thumb. A slider control is one possible representation of <input type="range">.

Allowable Properties

Only the following CSS properties can be used in a rule with ::-ms-fill-upper in its selector. Other properties are ignored.




Not part of any specification.

Browser compatibility

Historically supported in Internet Explorer and Edge before version 79.


See also

Document Tags and Contributors

Last updated by: wbamberg,