Hello Lorenzo,
I have a figure with a caption containing "\%", like in "this is 3\% of that". This breaks tex4ht (I run make4ht) because in filename.4tc the percent is not escaped anymore, so I find the line\doTocEntry\toclof{}{\csname a:TocLink\endcsname{1}{x1-28012}{}{\numberline {2.6}{\ignorespaces this is 3% of that.\relax }}}{30}\relax and the %-sign is interpreted as a comment, so the command gets broken. Is this behaviour known to you and is there a way to fix it?
I can confirm that this happens with the Caption package. It is not known, so thanks for the report.
I am currently dealing with COVID 19 and I am bit tired, so it may take some time before I will be able to fix this issue.
Best regards, Michal
