Dear Tomáš,
The error is caused by non-breaking space in the solution header.
I don't really understand why it happens, but it has a simple
work-around. Try this version of exerquiz.4ht:
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% exerquiz.4ht 2019-09-14-15:17 %
% Copyright (C) 1999-2009 Eitan M. Gurari %
% Copyright 2009-2019 TeX Users Group
%
% This work may be distributed and/or modified under the
% conditions of the LaTeX Project Public License, either
% version 1.3c of this license or (at your option) any
% later version. The latest version of this license is in
% http://www.latex-project.org/lppl.txt
% and version 1.3c or later is part of all distributions
% of LaTeX version 2005/12/01 or later.
%
% This work has the LPPL maintenance status "maintained".
%
% The Current Maintainer of this work
% is the TeX4ht Project <http://tug.org/tex4ht>.
%
% If you modify this program, changing the
% version identification would be appreciated.
\def\headerps@out#1{}
\let\Form\relax
\let\endForm\relax
\Configure{ }{\space}
\endinput
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
Best regards,
Michal
Thanks a lot, Michal, this update removed one warning from the DOM
filters.
In fact I noticed another issue with exerquiz package: when I
experimented with placing all solutions at the end of the document (by
simply removing the options "solutionsafter"), -a debug gave me
strange error
[33] [34] (./exerquiz_exx.sol
! Undefined control sequence.
<argument> \bf Příklad\relax \unhbox \voidb
@x \special
{t4ht@+&{35}x00A0{...
l.2 ...db@x \special {t4ht@+&{35}x00A0{59}}x1.1.}}
\eqterminex
I tried to redefine \eqterminex command, but it did not help.
Nevertheless, when running w/o -a debug, htlatex complaints about
error in every solution, but in the end the resulting HTML only
contains an extra @x in the header of each solution (which I can
easily remove by sed). Attached is a modification of what I've sent
earlier, if you wish to have a look. Anyway, since there is a simple
workaround, it's not urgent...
Thanks a lot,
cheers,
