It seems that the Caption package redefines lot of other packages commands. It does that after TeX4ht already patched commands from these packages, which results in lose of the inserted TeX4ht configurations. I think the only safe solution is to prevent Caption from patching of all these commands. Try this version of usepackage.4ht
:
% usepackage.4ht (2019-12-13-14:32), generated from tex4ht-4ht.tex
% Copyright 2003-2009 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.
\immediate\write-1{version 2019-12-13-14:32}
\def\:temp{tex4ht}\ifx \:temp\@currname
\:warning{\string\usepackage{tex4ht} again?}
\def\:temp#1htex4ht.def,tex4ht.sty#2!*?: {\def\:temp{#2}}
\expandafter\:temp \@filelist htex4ht.def,tex4ht.sty!*?: %
\ifx \:temp\empty \else
\:warning{if
\string\RequirePackage[tex4ht]{hyperref} or
\string\usepackage[tex4ht]{hyperref} was
used try instead, repectively,
\string\RequirePackage{hyperref} or
\string\usepackage{hyperref}}
\fi
\fi
\gdef\a:usepackage{\use:package xr,xr-hyper,eso-pic,expl3,savetrees,biblatex,xeCJK,polyglossia,fontspec,tikz,pdfbase,graphics,xcolor,imakeidx,minted,fancyhdr,caption,,!*?: }
\gdef\use:package#1,{%
\if :#1:\def\:temp##1!*?: {}\else
\def\:temp{#1}\ifx \@currname\:temp
\def\:temp##1!*?: {\input usepackage.4ht }%
\else \let\:temp=\use:package \fi
\fi \:temp}
\def\:temp{xr}\ifx \@currname\:temp
\AtEndOfPackage{\let\XR:\XR@
\def\XR@[#1]#2{%
\Configure{AtBeginDocument}{\XR:[#1]{#2}}{}}%
}
\fi
\def\:temp{xr-hyper}\ifx \@currname\:temp
\AtEndOfPackage{\let\XR:\XR@
\def\XR@[#1][#2]#3{%
\AtBeginDocument{\XR:[#1][#2]{#3}}
}%
}
\fi
\def\:temp{eso-pic}\ifx \@currname\:temp
\:dontusepackage{eso-pic}
\newcommand\AddToShipoutPicture{\@ifstar{}{}}
\let\AddToShipoutPictureBG\AddToShipoutPicture
\let\AddToShipoutPictureFG\AddToShipoutPicture
\fi
\def\:temp{expl3}\ifx \@currname\:temp
\ifdefined\XeTeXversion%
\xenunidelblock{Latin-expl3}%
\AtEndOfPackage{\xeuniuseblock{Latin-expl3}}
\fi
\fi
\def\:temp{savetrees}\ifx \@currname\:temp
\:dontusepackage{savetrees}
\fi
\def\:temp{biblatex}\ifx \@currname\:temp
\AtEndOfPackage{%
\def\blx@mknoautolang{%
\blx@lbxinput{\blx@languagename}%
{}{}%
}%
\def\blx@lbxinput@iii#1#2{%
\global\csundef{blx@lng@#2}%
\:IfFileExists{#1.lbx}
{\blx@lbxinput@iv{#2}{#1}{language '#2' -> '#1'}}
{\ifcsdef{blx@suffmaptried@#2}
{}
{\blx@warning@noline{%
File '#1.lbx' not found!\MessageBreak
Ignoring mapping '#2' -> '#1'}%
\global\cslet{blx@suffmaptried@#2}\@empty}%
\blx@lbxinput@iv{#2}{#2}{language '#2'}}}
}
\fi
\def\:temp{xeCJK}\ifx \@currname\:temp
\:dontusepackage{xeCJK}
\AtEndOfPackage{%
\RequirePackage{fontspec}
}
\DeclareDocumentCommand\setCJKmainfont{o m o}{}
\let\setCJKsansfont\setCJKmainfont
\let\setCJKmonofont\setCJKmainfont
\DeclareDocumentCommand\setCJKfamilyfont {m o m }{}
\DeclareDocumentCommand\newCJKfontfamily {o m o m}{\expandafter\gdef\csname #2\endcsname{\relax}}
\DeclareDocumentCommand\xeCJKsetup{m}{}
% }
\AtBeginDocument{%
\xeuniuseblock{CJK}
}
\fi
\def\:temp{polyglossia}\ifx \@currname\:temp
\ExplSyntaxOn
\AtEndOfPackage{
\cs_set_eq:NN\orig_polyglossia@keys_define_lang:n\polyglossia@keys_define_lang:n
\cs_set_protected:Npn \polyglossia@keys_define_lang:n #1 {
\orig_polyglossia@keys_define_lang:n{#1}
\keys_define:nn {polyglossia}{
#1 / direction
. code:n = {}
}
}
\def\RequireBidi{}%
}
\ExplSyntaxOff
\fi
\def\:temp{fontspec}\ifx \@currname\:temp
\ifdefined\fontspec
\:dontusepackage{fontspec}
\else
\input usepackage-fontspec.4ht
\fi
\fi
\def\:temp{tikz}\ifx \@currname\:temp
\AtEndOfPackage{%
\let\use:tikzlibrary\usetikzlibrary
\def\find:externalize#1external#2\@nil{%
\if\relax#2\relax\else
\let\tikz:externalize\tikzexternalize
\renewcommand\tikzexternalize[1][]{\tikz:externalize[##1,mode=only graphics]}
\tikzset{%
tex4ht inc/.style={%
/pgf/images/include external/.code={%
\includegraphics[]{####1.pdf}%
}%
}
}
\tikzset{tex4ht inc}
\fi
}
\renewcommand\usetikzlibrary[1]{%
\use:tikzlibrary{#1}%
\find:externalize#1external\@nil%
}
}
\fi
\def\:temp{pdfbase}\ifx\@currname\:temp
\AtEndOfPackage{%
\let\old:outputpage\@outputpage
\def\@outputpage{\old:outputpage{}}
}
\fi
\def\:temp{graphics}\ifx\@currname\:temp
\ifdefined\XeTeXversion
\PassOptionsToPackage{dvips}{graphics}
\fi
\fi
\def\:temp{xcolor}\ifx\@currname\:temp
\ifdefined\XeTeXversion
\PassOptionsToPackage{dvips}{xcolor}
\fi
\fi
\def\:temp{imakeidx}\ifx\@currname\:temp
\PassOptionsToPackage{noautomatic}{imakeidx}
\fi
\def\:temp{minted}\ifx\@currname\:temp
\AtEndOfPackage{%
\define@booleankey{minted@opt@g}{breaklines}{}{}{}%
}
\fi
\def\:temp{fancyhdr}\ifx\@currname\:temp
\AtEndOfPackage{%
\def\ps@fancy{}%
}
\fi
\def\:temp{caption}\ifx\@currname\:temp
\AtEndOfPackage{%
\long\def\caption@If@Package@Loaded#1[#2]#3#4{}
}
\fi
\endinput
The important part is this:
\def\:temp{caption}\ifx\@currname\:temp
\AtEndOfPackage{%
\long\def\caption@If@Package@Loaded#1[#2]#3#4{}
}
\fi
This code is inserted when Caption is loaded using \usepackage
the \AtEndOfPackage
executes code after the package code is loaded. It redefines the command responsible for package patching to do nothing.
This is the resulting HTML from your sample:
<body>
<div class='wrapfig-o'> </div>
</body>
tex4ebook -a debug
to stop on errors and show all terminal output.labelformat=empty
incaption
,tex4ht
will still generate a colon as if there are texts before the colon.wrapfigure
is ineffective fortex4ht
. I modify it tofigure
temporarily (I check the effect in calibre. I don't know whether kindle even supports wrapping images, incidentally).