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.
::-ms-tooltip CSS pseudo-element is a Microsoft extension that applies one or more styles to the tooltip of a slider control. A slider control is one possible representation of an <input> element of type="range".
Only the following CSS properties can be used in a rule with
::-ms-tooltip in its selector.