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<title>Test for dynamic insertion of ruby frames</title>
<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
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<p>'a' and 'b' should be paired with 'x' and 'y' respectively:</p>

<p><rb></rb><span></span><rb>a</rb><rb>b</rb><rt>x</rt><rt>y</rt></p>
<p><rb></rb><rt></rt><rb>a</rb><rb>b</rb><rt>x</rt><rt>y</rt></p>
<p><rb>a</rb><rt>x</rt><rb>b</rb><rt>y</rt></p>
<p><rbc><span>a</span><rb></rb>b</rbc><rt>x</rt><rt></rt><rt>y</rt></p>
<p><rb>a</rb><rb></rb><rb>b</rb><rtc><span>x</span><rt></rt>y</rtc></p>