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<title>Test for ruby line break suppression</title>
<link rel="author" title="Xidorn Quan" href="https://www.upsuper.org">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="help" href="https://drafts.csswg.org/css-ruby-1/#box-fixup">
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  span { white-space: pre; }
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<ruby><span>a
b</span></ruby><br>
<rbc><span>a
b</span></rbc><br>
<rtc><span>a
b</span></rtc><br>
<rb><span>a
b</span></rb><br>
<rt><span>a
b</span></rt><br>