Hi, 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? Best regards, Otso Helenius