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Test Info:

<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta charset="utf-8">
<title>Test dynamically changing dir attribute</title>
<meta name="assert" content="The dir attribute should update direction map to css properties dynamically">
<link rel="match" href="dynamic-dir-1-ref.html">
<script>
window.addEventListener("load", () => {
// force initial layout so we're sure what we're testing against
document.documentElement.getBoundingClientRect();
["math", "mstyle", "mrow"].forEach((tag) => {
let elements = document.getElementsByTagName(tag);
// set an explicit rtl where there was none
elements[0].setAttribute("dir", "rtl");
// change explicit ltr to rtl
elements[1].setAttribute("dir", "rtl");
// remove an explicitly set dir="rtl"
elements[2].removeAttribute("dir");
})
document.documentElement.classList.remove('reftest-wait');
})
</script>
</head>
<body>
<p>
math:
<math>
<mi>a</mi>
<mi>b</mi>
<mi>c</mi>
</math>
<math dir="ltr">
<mi>a</mi>
<mi>b</mi>
<mi>c</mi>
</math>
<math dir="rtl">
<mi>a</mi>
<mi>b</mi>
<mi>c</mi>
</math>
</p>
<p>
mstyle:
<math>
<mstyle>
<mi>a</mi>
<mi>b</mi>
<mi>c</mi>
</mstyle>
</math>
<math>
<mstyle dir="ltr">
<mi>a</mi>
<mi>b</mi>
<mi>c</mi>
</mstyle>
</math>
<math>
<mstyle dir="rtl">
<mi>a</mi>
<mi>b</mi>
<mi>c</mi>
</mstyle>
</math>
</p>
<p>
mrow:
<math>
<mrow>
<mi>a</mi>
<mi>b</mi>
<mi>c</mi>
</mrow>
</math>
<math>
<mrow dir="ltr">
<mi>a</mi>
<mi>b</mi>
<mi>c</mi>
</mrow>
</math>
<math>
<mrow dir="rtl">
<mi>a</mi>
<mi>b</mi>
<mi>c</mi>
</mrow>
</math>
</p>
<script src="/mathml/support/feature-detection.js"></script>
<script>MathMLFeatureDetection.ensure_for_match_reftest("has_dir");</script>
</body>
</html>