I'm in a need for more visual debugging aids. I tried the supp-vis
module, but it did not give enough cues.
I guess the ruledhbox is bound by ascender and descender height
vertically, but I'd like to see also the
cap height and x-height lines. Is it possible?
Plus, is it possible to display the individual box around each letter
similar to Knuth's TeXBook page 65?
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