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<!DOCTYPE html>
<html class="reftest-wait">
<head>
<title>displaystyle</title>
<meta charset="utf-8">
<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#the-displaystyle-and-scriptlevel-attributes">
<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#style-change-mstyle">
<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#underscripts-and-overscripts-munder-mover-munderover">
<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#operator-fence-separator-or-accent-mo">
<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#legacy-mathml-style-attributes">
<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#fractions-mfrac">
<link rel="match" href="displaystyle-014-ref.html"/>
<meta name="assert" content="Test dynamic change of mathbackground on an operator does not interfer with its displaystyle">
<script type="text/javascript">
function doTest() {
document.body.offsetTop; // Update layout
document.getElementById('mathOperator').
setAttribute('mathbackground', 'red');
document.documentElement.removeAttribute("class");
}
window.addEventListener("load", () => { document.fonts.ready.then(doTest); });
</script>
<link rel="stylesheet" href="/fonts/ahem.css">
<style>
math {
font: 25px Ahem;
}
</style>
</head>
<body>
<!-- See https://bugzilla.mozilla.org/show_bug.cgi?id=832800 -->
<math>
<mstyle displaystyle="true">
<mfrac>
<mrow>
<mn>X</mn>
<mo id="mathOperator">+</mo>
<mfrac>
<mrow><mn>X</mn></mrow>
<mrow><mn>X</mn></mrow>
</mfrac>
</mrow>
<mrow>
<mn>X</mn>
</mrow>
</mfrac>
</mstyle>
</math>
<script src="/mathml/support/feature-detection.js"></script>
<script>MathMLFeatureDetection.ensure_for_match_reftest("has_mfrac");</script>
</body>
</html>
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