Hi Richard, > > I have a plain TeX application in which I'd like to try converting some > non-tabular alignments into <pre> elements with text that's (roughly) > the alt text tex4ht would produce for those alignments in display math > mode. But I can't figure out how to produce that alt text directly. Any > advice/pointers/suggestions?
You can use \Picture+{}...\EndPicture command to convert the enclosed code to pictures. It automatically creates the alternative text too, based on the contents. See the documentation: https://www.kodymirus.cz/tex4ht-doc/Configurations.html#low-level-features To support also the PDF creation, I would create some extra commands that would do nothing in the PDF mode, but invoke \Picture+ in TeX4ht. The file mymacros.tex can look like this: %%%%%%%%%%%%%%%%%% \def\startalign{} \def\stopalign{} % code to be executed with TeX4ht \ifdefined\HCode \csname tex4ht\endcsname % load TeX4ht % redefine commands to produce pictures \def\startalign{\Picture+{}} \def\stopalign{\EndPicture} \fi %%%%%%%%%%%%%%%%%% You can use it in your document in this way: %%%%%%%%%%%%%%%%%% \input mymacros \startalign \vbox{\+if n$<$r \cleartabs& then n:=n+1\cr \+&else &begin print\_totals; n:=0;\cr \+&&end;\cr \+while p$>$0 do&\cr \+\quad\cleartabs&begin q:= link(p); free\_node(p); p:=q\cr \+&end;\cr} \stopalign \bye %%%%%%%%%%%%%%%%%% Best regards, Michal