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<title>Ruby whitespace handling</title>
<link rel="author" title="Sam Bowen" href="mailto:[email protected]">
<link rel="author" title="Mozilla" href="https://www.mozilla.org">
<link rel="help" href="https://drafts.csswg.org/css-ruby-1/#white-space">
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abcd<rbc> BASE</rbc><rt>TEXT</rt>
abcd<rbc> <span>BASE</span></rbc><rt>TEXT</rt>
abcd<rbc><span> BASE</span></rbc><rt>TEXT</rt>
<rbc> </rbc>