The escaping round-trip test's data (A & "B") only contained & and ",
so the <,> branches of escapeHtmlAttr (&,",<,>) and escapeHtmlText (&,<,>)
were never exercised; a regression dropping <,> escaping would still pass.
Extend the data to A & <B> "C" in both the data-label attribute and the
visible text so both functions' <,> branches are genuinely covered. Assert
the well-formed escaped tag (attr: A & <B> "C", text:
A & <B> "C"), explicitly reject the raw tag-corrupting forms,
and confirm markdownToHtml restores the originals. Comment updated to match.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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