In practice, the line-height value adjusts the vertical position of the superscript. Smaller values raise it higher, larger push it lower. Without this attribute it sits at the baseline.
'Text-top' should work without disrupting the line-height, and frankly so should 'super', but CSS is biased towards making sure text doesn't collide rather than maintaining a regular line-height, and this is the only value I found that will override that annoying behaviour.
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