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<!DOCTYPE html>
<meta charset="utf-8">
<title>mathbackground on mrow</title>
<link rel="mismatch" href="mathbackground-001-notref.html"/>
<meta name="assert" content="mathbackground on a mrow has a visual effect.">
<mrow mathbackground="red">
<mtext>□■□■□■□</mtext>
</mrow>
</math>