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-tooltip CSS pseudo-element is a Microsoft extension that applies one or more styles to the tooltip of a slider <input type="range">.
Syntax
::-ms-tooltip {...}
Propriedades
The only CSS properties that can be used on ::-ms-tooltip are display and visibility, for hiding the pseudo-element.