mathml/relations/css-styling/width-height-001.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>width, height, inline-size and block-size</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#layout-algorithms">
<meta name="assert" content="Verify that width, height, inline-size and block-size properties set the size of the content box.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/feature-detection.js"></script>
<script src="/mathml/support/mathml-fragments.js"></script>
<script src="/mathml/support/box-comparison.js"></script>
<style>
  /* Revert style specified in the UA style sheet that changes box size. */
  merror { border: 0; }
  mfrac { padding: 0; }
</style>
<script>
  var epsilon = 1;

  setup({ explicit_done: true });
  window.addEventListener("load", runTests);

  function runTests() {

    for (tag in MathMLFragments) {
        if (!FragmentHelper.isValidChildOfMrow(tag))
            continue;

        document.body.insertAdjacentHTML("beforeend", `<div style="position: absolute;"><math><mrow>${MathMLFragments[tag]}</mrow></math></div>`);
        let div = document.body.lastElementChild;
        let element = FragmentHelper.element(div.firstElementChild);
        FragmentHelper.forceNonEmptyDescendants(element);

        test(function() {
            assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
            var style = `width: 500px; height: 400px;`;
            element.setAttribute("style", style);
            let box = element.getBoundingClientRect();
            assert_approx_equals(box.width, 500, epsilon, "width");
            assert_approx_equals(box.height, 400, epsilon, "height");
        }, `width and height properties on ${tag}`);

        test(function() {
            assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
            var style = `inline-size: 600px; block-size: 700px;`;
            element.setAttribute("style", style);
            let box = element.getBoundingClientRect();
            assert_approx_equals(box.width, 600, epsilon, "width");
            assert_approx_equals(box.height, 700, epsilon, "height");
        }, `inline-size and block-size properties on ${tag}`);

        // Test that if we specify a size smaller than the content, then
        // it is used too. Note that we skip mtable, which follows CSS
        // tables rules and behave differently in that case.
        if (tag != "mtable") {
            test(function() {
                assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
                var style = `width: 2px; height: 1px;`;
                element.setAttribute("style", style);
                let box = element.getBoundingClientRect();
                assert_approx_equals(box.width, 2, epsilon, "width");
                assert_approx_equals(box.height, 1, epsilon, "height");
            }, `width and height properties on ${tag} (content overflowing)`);
        }

        div.style = "display: none;"; // Hide the div after measurement.

        document.body.insertAdjacentHTML("beforeend", `<div style="position: absolute;"><div style="display: inline-block"><math><mrow>${MathMLFragments[tag]}</mrow></math></div></div>`);
        let shrinkWrapDiv = document.body.lastElementChild.firstElementChild;
        element = FragmentHelper.element(shrinkWrapDiv.firstElementChild);
        FragmentHelper.forceNonEmptyDescendants(element);

        test(function() {
            assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
            var style = `width: 300px;`;
            element.setAttribute("style", style);
            let refPreferredWidth = 300;

            // In the case of mo, spacing is added around the element so that it is included
            // in the preferred width calculation, which should be the sum of lspace, rspace and width.
            if (tag === "mo") {
              element.setAttribute("lspace", "50px");
              element.setAttribute("rspace", "30px");
              refPreferredWidth = 380;
            }

            let box = shrinkWrapDiv.getBoundingClientRect();
            assert_approx_equals(box.width, refPreferredWidth, epsilon);
        }, `width property on ${tag} (preferred width)`);

        div.style = "display: none;"; // Hide the div after measurement.
    }

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