I filed an @elk bug about compatibility with @takahe and then @shuuji3 saw my bug and figured out what was causing it and explained in a new issue on the tahahē repo and @andrew then had to rewrite the entire HTML parser! Opens source is pretty amazing sometimes.
https://github.com/elk-zone/elk/issues/1336
https://github.com/jointakahe/takahe/issues/479