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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>mathbackground on mtext</title>
<link rel="mismatch" href="mathbackground-003-notref.html"/>
<meta name="assert" content="mathbackground on a mtext has a visual effect.">
<mtext mathbackground="red">□■□■□■□</mtext>
</math>