Add another roundtrip test.

Fix HtmlToDjot table and reference escaping (#175)

Fix HtmlToDjot remaining serialization edge cases (#174)

Fix HtmlToDjot container and list block serialization (#173)

Fix O(n²) performance issue with single quote smart quote matching (#172)

Preserve unsupported figures as raw HTML blocks (#171)

Fix SemanticSpanExtension samp and var rendering (#170)

Fix HtmlToDjot inline quote escaping (#169)

Add semantic HTML element support to HtmlToDjot (#168)

Fix HtmlToDjot multiline attribution and captions (#167)

Fix HtmlToDjot MathML extraction edge cases (#166)

Add HTML→Djot enhancements: attribution, wrapper unwrap, MathML (#165)

Fix HtmlToDjot block structure edge cases (#164)

Fix HtmlToDjot edge cases for divs, titles, and nested tables (#163)

Normalize configured schemes and fix XHTML footnotes (#162)