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Test Info:

<!DOCTYPE html>
<meta charset="utf-8">
<title>mathbackground on semantics</title>
<link rel="mismatch" href="mathbackground-004-notref.html"/>
<meta name="assert" content="mathbackground on a semantics has a visual effect.">
<semantics mathbackground="green">
<mtext>□■□■□■□</mtext>
</semantics>
</math>