mathml/relations/css-styling/dynamic-dir-1.html

<!DOCTYPE html>
<html class="reftest-wait">
<head>
  <meta charset="utf-8">
  <title>Test dynamically changing dir attribute</title>
  <link rel="help" href="https://w3c.github.io/mathml-core/#css-styling">
  <link rel="help" href="https://w3c.github.io/mathml-core/#attributes-common-to-html-and-mathml-elements">
  <link rel="help" href="https://w3c.github.io/mathml-core/#dom-and-javascript">
  <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>