testing/web-platform/tests/mathml/relations/css-styling/mathbackground-004-notref.html


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<!DOCTYPE html>
<meta charset="utf-8">
<title>mathbackground on semantics (reference)</title>
<math xmlns="http://www.w3.org/1998/Math/MathML">
  <semantics mathbackground="red">
    <mtext>□■□■□■□</mtext>
  </semantics>
</math>