[this bug is NOT targeted to the upcoming trixie release]

ruby-ronn autopkg test fails to build with libxml 2.14.x from
experimental, and all dependencies built with this libxml version.

[...]

212s
===============================================================================
212s Failure: test_angle_bracket_syntax_HTML(RonnTest):
212s   ---
/tmp/autopkgtest.xJEsc6/build.LPv/src/test/angle_bracket_syntax.html
2025-06-06 18:27:26.000000000 +0000
212s   +++
/tmp/autopkgtest.xJEsc6/build.LPv/src/test/angle_bracket_syntax.html.wrong
2025-06-06 18:27:43.921579655 +0000
212s   @@ -13,7 +13,7 @@
212s
212s    <p>or when <code><WORD></code> is enclosed in backticks.</p>
212s
212s   -<p>or when <var>WORD</var> has a <dot.> or
<colon>.</colon></dot.></p>
212s   +<p>or when <var>WORD</var> has a <dot.> or
<foo:colon>.</foo:colon></dot.></p>
212s
212s    <h2 id="Escaping-angle-brackets">Escaping angle brackets</h2>
212s
212s   .
212s /tmp/autopkgtest.xJEsc6/build.LPv/src/test/test_ronn.rb:43:in
`flunk_with_diff'
212s /tmp/autopkgtest.xJEsc6/build.LPv/src/test/test_ronn.rb:96:in
`block (2 levels) in <class:RonnTest>'
212s
===============================================================================