test: add rst citations and footnote (#267)

tests/fixtures/test_rst_citations.html

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+<p>Citation references, like <a href="#cit2002" id="citation-reference-1" rel="nofollow">[CIT2002]</a>.
+Note that citations may get
+rearranged, e.g., to the bottom of
+the “page”.</p>
+<div class="citation-list">
+<div class="citation" id="cit2002">
+<span class="label"><span class="fn-bracket">[</span><a href="#citation-reference-1" rel="nofollow">CIT2002</a><span class="fn-bracket">]</span></span>
+<p>A citation
+(as often used in journals).</p>
+</div>
+</div>
+<p>Citation labels contain alphanumerics,
+underlines, hyphens and fullstops.
+Case is not significant.</p>
+<p>Given a citation like <a href="#this" id="citation-reference-2" rel="nofollow">[this]</a>, one
+can also refer to it like <a href="#this" rel="nofollow">this</a>.</p>
+<div class="citation-list">
+<div class="citation" id="this">
+<span class="label"><span class="fn-bracket">[</span><a href="#citation-reference-2" rel="nofollow">this</a><span class="fn-bracket">]</span></span>
+<p>here.</p>
+</div>
+</div>

tests/fixtures/test_rst_citations.rst

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+.. Citations https://docutils.sourceforge.io/docs/user/rst/quickref.html#citations
+
+Citation references, like [CIT2002]_.
+Note that citations may get
+rearranged, e.g., to the bottom of
+the "page".
+
+.. [CIT2002] A citation
+   (as often used in journals).
+
+Citation labels contain alphanumerics,
+underlines, hyphens and fullstops.
+Case is not significant.
+
+Given a citation like [this]_, one
+can also refer to it like this_.
+
+.. [this] here.

tests/fixtures/test_rst_footnotes.html

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+<p>Footnote references, like <a href="#footnote-1" id="footnote-reference-1" rel="nofollow"><span class="fn-bracket">[</span>5<span class="fn-bracket">]</span></a>.
+Note that footnotes may get
+rearranged, e.g., to the bottom of
+the “page”.</p>
+<aside class="footnote-list brackets">
+<aside class="footnote brackets" id="footnote-1">
+<span class="label"><span class="fn-bracket">[</span><a href="#footnote-reference-1" rel="nofollow">5</a><span class="fn-bracket">]</span></span>
+<p>A numerical footnote. Note
+there’s no colon after the <span class="docutils literal">]</span>.</p>
+</aside>
+</aside>
+<p>Autonumbered footnotes are
+possible, like using <a href="#footnote-2" id="footnote-reference-2" rel="nofollow"><span class="fn-bracket">[</span>1<span class="fn-bracket">]</span></a> and <a href="#footnote-3" id="footnote-reference-3" rel="nofollow"><span class="fn-bracket">[</span>2<span class="fn-bracket">]</span></a>.</p>
+<aside class="footnote-list brackets">
+<aside class="footnote brackets" id="footnote-2">
+<span class="label"><span class="fn-bracket">[</span><a href="#footnote-reference-2" rel="nofollow">1</a><span class="fn-bracket">]</span></span>
+<p>This is the first one.</p>
+</aside>
+<aside class="footnote brackets" id="footnote-3">
+<span class="label"><span class="fn-bracket">[</span><a href="#footnote-reference-3" rel="nofollow">2</a><span class="fn-bracket">]</span></span>
+<p>This is the second one.</p>
+</aside>
+</aside>
+<p>They may be assigned ‘autonumber
+labels’ - for instance,
+<a href="#fourth" id="footnote-reference-4" rel="nofollow"><span class="fn-bracket">[</span>4<span class="fn-bracket">]</span></a> and <a href="#third" id="footnote-reference-5" rel="nofollow"><span class="fn-bracket">[</span>3<span class="fn-bracket">]</span></a>.</p>
+<aside class="footnote-list brackets">
+<aside class="footnote brackets" id="third">
+<span class="label"><span class="fn-bracket">[</span><a href="#footnote-reference-5" rel="nofollow">3</a><span class="fn-bracket">]</span></span>
+<p>a.k.a. <a href="#third" rel="nofollow">third</a></p>
+</aside>
+<aside class="footnote brackets" id="fourth">
+<span class="label"><span class="fn-bracket">[</span><a href="#footnote-reference-4" rel="nofollow">4</a><span class="fn-bracket">]</span></span>
+<p>a.k.a. <a href="#fourth" rel="nofollow">fourth</a></p>
+</aside>
+</aside>
+<p>Auto-symbol footnotes are also
+possible, like this: <a href="#footnote-4" id="footnote-reference-6" rel="nofollow"><span class="fn-bracket">[</span>*<span class="fn-bracket">]</span></a> and <a href="#footnote-5" id="footnote-reference-7" rel="nofollow"><span class="fn-bracket">[</span>†<span class="fn-bracket">]</span></a>.</p>
+<aside class="footnote-list brackets">
+<aside class="footnote brackets" id="footnote-4">
+<span class="label"><span class="fn-bracket">[</span><a href="#footnote-reference-6" rel="nofollow">*</a><span class="fn-bracket">]</span></span>
+<p>This is the first one.</p>
+</aside>
+<aside class="footnote brackets" id="footnote-5">
+<span class="label"><span class="fn-bracket">[</span><a href="#footnote-reference-7" rel="nofollow">†</a><span class="fn-bracket">]</span></span>
+<p>This is the second one.</p>
+</aside>
+</aside>

tests/fixtures/test_rst_footnotes.rst

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+.. Footnotes https://docutils.sourceforge.io/docs/user/rst/quickref.html#footnotes
+
+Footnote references, like [5]_.
+Note that footnotes may get
+rearranged, e.g., to the bottom of
+the "page".
+
+.. [5] A numerical footnote. Note
+   there's no colon after the ``]``.
+
+Autonumbered footnotes are
+possible, like using [#]_ and [#]_.
+
+.. [#] This is the first one.
+.. [#] This is the second one.
+
+They may be assigned 'autonumber
+labels' - for instance,
+[#fourth]_ and [#third]_.
+
+.. [#third] a.k.a. third_
+
+.. [#fourth] a.k.a. fourth_
+
+Auto-symbol footnotes are also
+possible, like this: [*]_ and [*]_.
+
+.. [*] This is the first one.
+.. [*] This is the second one.