mathml/relations/html5-tree/display-1.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8"/>
<title>MathML display attribute</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#css-styling">
<link rel="help" href="https://w3c.github.io/mathml-core/#the-top-level-math-element">
<link rel="help" href="https://w3c.github.io/mathml-core/#dom-and-javascript">
<meta name="assert" content="Verify that the display attribute on the math element is supported and impacts centering and line breaking with surrounding content.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/feature-detection.js"></script>
<script src="/mathml/support/attribute-values.js"></script>
<script>
  function getBox(aId) {
    return document.getElementById(aId).getBoundingClientRect();
  }
  window.addEventListener("DOMContentLoaded", function() {
      for (transform in AttributeValueTransforms) {
          TransformAttributeValues(transform, ["display"]);
          var content = getBox("content");

          var before_block = getBox("before_block");
          var mspace_block = getBox("mspace_block");
          var after_block = getBox("after_block");
          test(function() {
              assert_true(MathMLFeatureDetection.has_mspace());
              assert_approx_equals(before_block.left, content.left, 1,
                                   "content before must be left aligned");
              assert_approx_equals((mspace_block.left + mspace_block.right) / 2,
                                   (content.left + content.right) / 2,
                                   1,
                                   "math must be centered.");
              assert_approx_equals(after_block.left, content.left, 1,
                                   "content after must be left aligned");
              assert_less_than_equal(before_block.bottom, mspace_block.top,
                                     "new line before math");
              assert_less_than_equal(mspace_block.bottom, after_block.top,
                                     "new line after math");
          }, `Test display math ${transform}`);

          var before_inline = getBox("before_inline");
          var mspace_inline = getBox("mspace_inline");
          var after_inline = getBox("after_inline");
          test(function() {
              assert_true(MathMLFeatureDetection.has_mspace());
              assert_approx_equals((before_inline.top + before_inline.bottom) / 2,
                                   (mspace_inline.top + mspace_inline.bottom) / 2,
                                   1,
                                   "content before must be horizontally aligned with math");
              assert_approx_equals((after_inline.top + after_inline.bottom) / 2,
                                   (mspace_inline.top + mspace_inline.bottom) / 2,
                                   1,
                                   "content after must be horizontally aligned with math");
              assert_less_than_equal(before_inline.right, mspace_inline.left,
                                     "content before must be on the left of math");
              assert_less_than_equal(mspace_inline.right, after_inline.left,
                                     "content after must be on the right of math");
          }, `Test inline math ${transform}`);

          var before_block_and_specified_width = getBox("before_block_and_specified_width");
          var mspace_width = getBox("mspace_width");
          var after_block_and_specified_width = getBox("after_block_and_specified_width");
          test(function() {
              assert_true(MathMLFeatureDetection.has_mspace());
              assert_approx_equals(before_block_and_specified_width.left, content.left, 1,
                                   "content before must be left aligned");
              assert_approx_equals((mspace_width.left + mspace_width.right) / 2,
                                   (content.left + content.right) / 2,
                                   1,
                                   "math must be centered.");
              assert_approx_equals(after_block_and_specified_width.left, content.left, 1,
                                   "content after must be left aligned");
              assert_less_than_equal(before_block_and_specified_width.bottom, mspace_width.top,
                                     "new line before math");
              assert_less_than_equal(mspace_width.bottom, after_block_and_specified_width.top,
                                     "new line after math");
          }, `Test width on display=block math ${transform}`);
      }

      test(function() {
          assert_true(MathMLFeatureDetection.has_mspace());
          document.getElementById("mspace_dynamic_block").parentNode.
              setAttribute("display", "block");
          var before_block = getBox("before_dynamic_block");
          var mspace_block = getBox("mspace_dynamic_block");
          var after_block = getBox("after_dynamic_block");

          assert_true(MathMLFeatureDetection.has_mspace());
          assert_approx_equals(before_block.left, content.left, 1,
                               "content before must be left aligned");
          assert_approx_equals((mspace_block.left + mspace_block.right) / 2,
                               (content.left + content.right) / 2,
                               1,
                               "math must be centered.");
          assert_approx_equals(after_block.left, content.left, 1,
                               "content after must be left aligned");
          assert_less_than_equal(before_block.bottom, mspace_block.top,
                                 "new line before math");
          assert_less_than_equal(mspace_block.bottom, after_block.top,
                                 "new line after math");
      }, "Test dynamically setting display=block");

      test(function() {
          assert_true(MathMLFeatureDetection.has_mspace());
          document.getElementById("mspace_dynamic_inline").parentNode.
              removeAttribute("display");
          var before_inline = getBox("before_dynamic_inline");
          var mspace_inline = getBox("mspace_dynamic_inline");
          var after_inline = getBox("after_dynamic_inline");
          assert_true(MathMLFeatureDetection.has_mspace());
          assert_approx_equals((before_inline.top + before_inline.bottom) / 2,
                               (mspace_inline.top + mspace_inline.bottom) / 2,
                               1,
                               "content before must be horizontally aligned with math");
          assert_approx_equals((after_inline.top + after_inline.bottom) / 2,
                               (mspace_inline.top + mspace_inline.bottom) / 2,
                               1,
                               "content after must be horizontally aligned with math");
          assert_less_than_equal(before_inline.right, mspace_inline.left,
                                 "content before must be on the left of math");
          assert_less_than_equal(mspace_inline.right, after_inline.left,
                                 "content after must be on the right of math");
      }, "Test dynamically setting display=inline");

      done();
  });
</script>
<style>
  #content {
    width: 600px;
    background: #ccc;
  }
  span.square {
    display: inline-block;
    width: 50px;
    height: 50px;
    background: black;
  }
  mspace {
    background: blue;
  }
</style>
</head>
<body>
  <div id="log"></div>
  <div id="content">
    <span id="before_block" class="square"></span>
    <math display="block"><mspace id="mspace_block" width="50px" height="50px"/></math>
    <span id="after_block" class="square"></span>
    <br/>
    <span id="before_inline" class="square"></span>
    <math display="inline"><mspace id="mspace_inline" width="50px" height="50px"/></math>
    <span id="after_inline" class="square"></span>
    <br/>
    <span id="before_block_and_specified_width" class="square"></span>
    <math display="block" style="width:100px"><mspace id="mspace_width" width="50px" height="50px"/></math>
    <span id="after_block_and_specified_width" class="square"></span>
    <br/>
    <div>
      <span id="before_dynamic_block" class="square"></span>
      <math><mspace id="mspace_dynamic_block" width="50px" height="50px"/></math>
      <span id="after_dynamic_block" class="square"></span>
    </div>
    <div>
      <span id="before_dynamic_inline" class="square"></span>
      <math display="block"><mspace id="mspace_dynamic_inline" width="50px" height="50px"/></math>
      <span id="after_dynamic_inline" class="square"></span>
    </div>
  </div>
</body>
</html>