> Here is an example:
> ```
> \documentclass{article}
> \usepackage[utf8]{inputenc}
> \usepackage[notes]{biblatex-chicago}
> \addbibresource{biblatex-examples.bib}
> \begin{document}
> Hello |
> \end{document}
> ```
This is not related to tex4ht. You would get this in latex too. The
default fontencoding OT1 is a bit restricted and has chars in odd
places.
You need either \usepackage[T1]{fontenc} or should use a command like
\textbar.
--
Mit freundlichen Grüßen
Ulrike Fischer
