[0] https://www.w3.org/TR/css-inline-3/#leading-trim
[1] https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/P...
[2] https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/P...
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Or a negative text-indent, if you want arbitrary content rather than just a tick.
I think the lh unit is surely part of the puzzle, but something more is needed. It assumes that the ascent and descent are symmetrical, for one thing.
[0] https://www.w3.org/TR/css-inline-3/#leading-trim
[1] https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/P...
[2] https://developer.mozilla.org/en-US/docs/Web/CSS/Reference/P...
reply