Cap height

The height of a flat-topped capital, measured from the baseline, and usually a little below the ascender.

Near it

measured on this shelf	the top of the drawn H stands at 700 units of 1000 on 19 of the 23 families; the four that differ are Drew Pixel at 722, whose grid rounds the cap to its own step, Drew Extrude at 739, and Drew Stencil and Drew Perforate at 757, whose strokes are cut into pieces that keep round ends, so the ink runs half a stroke past the cap line as it runs past the baseline	measured over all 23 house families, Regular, with fontTools on the fixed shelf, 2026-09-24. The eight-height spread this row carried (678 to 785, twelve at 757) was measured before the baseline fix, when most faces stood 57 units low
on this shelf it is also the ascender line	b, d, l and k top out at exactly the cap height on all 23 families	so the cap line and the ascender line are one line here, which is not true of every shelf and is a fact about ours
here the table and the ink agree	OS/2 sCapHeight matches the drawn cap on 23 of 23 families	and sxHeight matches the drawn x on the same 23 files too, but not on 3 of the 84, where it differs by 1 unit: a record has to say which of the two it is quoting rather than assume they are one number