Add a TeX4ht example document

Progresses #90.

Makefile

@@ -15,7 +15,8 @@ ARCHIVES=$(TDSARCHIVE) $(CTANARCHIVE) $(DISTARCHIVE)
 EXAMPLES_RESOURCES=examples/example.md examples/scientists.csv
 EXAMPLES_SOURCES=examples/context-mkii.tex examples/context-mkiv.tex examples/latex.tex
 EXAMPLES=examples/context-mkii.pdf examples/context-mkiv.pdf \
-  examples/latex-pdftex.pdf examples/latex-luatex.pdf examples/latex-xetex.pdf
+  examples/latex-pdftex.pdf examples/latex-luatex.pdf examples/latex-xetex.pdf \
+  examples/latex-tex4ht.html examples/latex-tex4ht.css
 TESTS=tests/test.sh tests/support/*.tex tests/templates/*/*.tex.m4 \
   tests/templates/*/COMMANDS.m4 tests/testfiles/*/*.test
 MAKES=Makefile $(addsuffix /Makefile, $(SUBDIRECTORIES)) latexmkrc

examples/Makefile

@@ -9,7 +9,7 @@ LUACLI_OPTIONS=cacheDir=_markdown_example hashEnumerators=true \
   smartEllipses=true fencedCode=true contentBlocks=true pipeTables=true \
   tableCaptions=true taskLists=true
 OUTPUT=context-mkii.pdf context-mkiv.pdf latex-pdftex.pdf \
-  latex-luatex.pdf latex-xetex.pdf
+  latex-luatex.pdf latex-xetex.pdf latex-tex4ht.html latex-tex4ht.css
 
 # This is the default pseudo-target.
 all: $(OUTPUT)
@@ -41,6 +41,14 @@ latex-luatex.pdf: latex.tex example.tex
 	lualatex latex-luatex
 	lualatex latex-luatex
 
+# This target typesets the LaTeX example using TeX4ht.
+latex-tex4ht.html latex-tex4ht.css: latex.tex example.tex
+	-make4ht --shell-escape latex fn-in
+	cp latex.html latex-tex4ht.html
+	sed -ri 's/latex\.(html|css)/latex-tex4ht.\1/g' latex-tex4ht.html
+	cp latex.css latex-tex4ht.css
+	make4ht -m clean latex
+
 # This target converts the markdown example to a plain TeX representation
 # using the Lua command-line interface for the Markdown package.
 example.tex: example.md
@@ -50,6 +58,7 @@ example.tex: example.md
 clean:
 	rm -f $(AUXFILES)
 	rm -rf $(AUXDIRS)
+	make4ht -m clean latex
 
 # This pseudo-target removes any makeable files.
 implode: clean

examples/latex.tex

@@ -48,4 +48,23 @@
 \begin{markdown}
 Here are some non-ASCII characters: *ěščřžýáíé*.
 \end{markdown}
+
+\begin{markdown*}{html, hybrid}
+Here is some <b>HTML code</b> mixed *with Markdown*. In pdfTeX, the HTML code
+will be silently ignored, whereas in \TeX 4ht, the HTML code will be passed
+through to the output:
+
+<table border="1">
+  <tr>
+    <td>Emil</td>
+    <td>Tobias</td>
+    <td>Linus</td>
+  </tr>
+  <tr>
+    <td>16</td>
+    <td>14</td>
+    <td>10</td>
+  </tr>
+</table>
+\end{markdown*}
 \end{document}