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.
Summary
The ::-ms-fill-upper 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 greater than the value currently selected by the thumb.
Specifications
Not part of any specification.
Microsoft has a description on MSDN.
Browser compatibility
| Feature | Firefox (Gecko) | Chrome | Edge | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | No support | No support | (Yes) | (Yes) | No support | No support |
| Feature | Firefox Mobile (Gecko) | Android | Edge | IE Phone | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | No support | No support | (Yes) | ? | No support | No support |
See also
- The pseudo-elements used by IE/Edge to style other parts of a range input:
::-moz-range-progress- CSS-Tricks: Styling Cross-Browser Compatible Range Inputs with CSS
- QuirksMode: Styling and scripting sliders