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<title>CSS-contain test reference: style containment dynamic containment set unset invalidation</title>
<link rel="author" title="Daniil Sakhapov" href="sakhapov@google.com">
<p>Test passes if the text below is "A1(+-" (not including the quotation marks).<p>
<div>A<div>1 (</div>+ -</div>