The .web files aren't meant to be read raw; you should instead read the typeset version (http://texdoc.net/texmf-dist/doc/generic/knuth/mf/mf.pdf http://texdoc.

The .web files aren't meant to be read raw; you should instead read the typeset version (http://texdoc.net/texmf-dist/doc/generic/knuth/mf/mf.pdf http://texdoc.net/texmf-dist/doc/generic/knuth/mf/mf.pdf) Even better to read from volumes C, D, E of the Computers and Typesetting series (https://cs.stanford.edu/~knuth/abcde.html https://cs.stanford.edu/~knuth/abcde.html). Specifically in this case, Volume D (METAFONT: The Program) — the mini-indices on each page spread are useful if you're trying to understand the program, and they're missing in the typeset PDF (above) that you can get with weave.