<!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());
let math = getBox("math_with_specified_width");
assert_approx_equals(before_block_and_specified_width.left, math.left, 1,
"content before must be left aligned");
assert_approx_equals(math.width, 100, 1,
"math uses specified width.");
assert_approx_equals((mspace_width.left + mspace_width.right) / 2,
(math.left + math.right) / 2,
1,
"math must be centered.");
assert_approx_equals(after_block_and_specified_width.left, math.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" id="math_with_specified_width" style="background: pink; 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>
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