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 represents the tooltip of a slider control. A slider control is one possible representation of <input type="range">.
Only the following CSS properties can be used in a rule with ::-ms-tooltip in its selector. Other properties are ignored.
::-ms-tooltip
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https://developer.mozilla.org/en-US/docs/Web/CSS/::-ms-tooltip