mathml/relations/css-styling/attribute-mapping-002.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Attribute mapping</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#the-mathvariant-attribute">
<link rel="help" href="https://w3c.github.io/mathml-core/#the-displaystyle-and-scriptlevel-attributes">
<meta name="assert" content="Verify that mathvariant, scriptlevel, displaystyle are mapped to CSS">
<link rel="stylesheet" href="/fonts/ahem.css">
<style>
  #container {
      /* Ahem font does not have a MATH table so the font-size scale factor
         is always 0.71^{computed - inherited math script level} */
      font: 100px/1 Ahem;
  }
</style>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/mathml-fragments.js"></script>
<script>
  setup({ explicit_done: true });
  window.addEventListener("load", runTests);
  function fontSize(style) {
      return parseFloat((/(.+)px/).exec(style.getPropertyValue("font-size"))[1]);
  }
  function runTests() {
      var container = document.getElementById("container");
      for (tag in MathMLFragments) {
          container.insertAdjacentHTML("beforeend", `<math>${MathMLFragments[tag]}</math>`);
      }
      Array.from(document.getElementsByClassName("element")).forEach(element => {
          var tag = element.tagName;
          var style = window.getComputedStyle(element);

          test(function() {
              assert_equals(style.getPropertyValue("text-transform"),
                            tag === "mi" ? "math-auto" : "none",
                            "no attribute");
              element.setAttribute("mathvariant", "fraktur");
              assert_equals(style.getPropertyValue("text-transform"), "math-fraktur", "attribute specified");
              element.setAttribute("mathvariant", "DoUbLe-StRuCk");
              assert_equals(style.getPropertyValue("text-transform"), "math-double-struck", "case insensitive");
          }, `mathvariant on the ${tag} element is mapped to CSS text-transform`)

          test(function() {
              // none and mprescripts appear as scripts
              assert_equals(style.getPropertyValue("math-depth"), tag === "none" || tag === "mprescripts" ? "1" : "0", "no attribute");

              var absoluteScriptlevel = 2;
              element.setAttribute("scriptlevel", absoluteScriptlevel);
              assert_equals(style.getPropertyValue("math-depth"), "" + absoluteScriptlevel, "attribute specified <U>");

              var positiveScriptlevelDelta = 1;
              element.setAttribute("scriptlevel", `+${positiveScriptlevelDelta}`);
              assert_equals(style.getPropertyValue("math-depth"), "" + positiveScriptlevelDelta, "attribute specified +<U>");

              var negativeScriptlevelDelta = -3;
              element.setAttribute("scriptlevel", `${negativeScriptlevelDelta}`);
              assert_equals(style.getPropertyValue("math-depth"), "" + negativeScriptlevelDelta, "attribute specified -<U>");

              element.setAttribute("scriptlevel", absoluteScriptlevel);
              element.setAttribute("mathsize", "42px");
              assert_approx_equals(fontSize(style), 42, 1, "mathsize wins over scriptlevel");

          }, `scriptlevel on the ${tag} element is mapped to math-depth(...)`);

          test(function() {
              // none and mprescripts appear as scripts
              let expected = 0;
              element.setAttribute("scriptlevel", "" + expected);
              assert_equals(style.getPropertyValue("math-depth"), "" + expected, "no attribute");

              element.setAttribute("scriptlevel", " +1");
              assert_equals(style.getPropertyValue("math-depth"), "" + expected, "invalid scriptlevel value");

              element.setAttribute("scriptlevel", " + 1");
              assert_equals(style.getPropertyValue("math-depth"), "" + expected, "invalid scriptlevel value");

              element.setAttribute("scriptlevel", "2.0");
              assert_equals(style.getPropertyValue("math-depth"), "" + expected, "invalid scriptlevel value");

              element.setAttribute("scriptlevel", "-3\"");
              assert_equals(style.getPropertyValue("math-depth"), "" + expected, "invalid scriptlevel value");

              element.setAttribute("scriptlevel", "200px");
              assert_equals(style.getPropertyValue("math-depth"), "" + expected, "invalid scriptlevel value");

              element.setAttribute("scriptlevel", "add(2)");
              assert_equals(style.getPropertyValue("math-depth"), "" + expected, "invalid scriptlevel value");

          }, `invalid scriptlevel values on the ${tag} element are not mapped to math-depth(...)`);

          test(function() {
              assert_equals(style.getPropertyValue("math-style"), "compact", "no attribute");
              element.setAttribute("displaystyle", "true");
              assert_equals(style.getPropertyValue("math-style"), "normal", "attribute specified");
              element.setAttribute("displaystyle", "TrUe");
              assert_equals(style.getPropertyValue("math-style"), "normal", "case insensitive");
          }, `displaystyle on the ${tag} element is mapped to CSS math-style`);
      });

      done();
  }
</script>
</head>
<body>
  <div id="log"></div>
  <div id="container">
    <math class="element"></math>
  </div>
</body>
</html>