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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Elements not participating to the layout of their parent</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#layout-algorithms">
<meta name="assert" content="Verify that display: none and out-of-flow positioned elements do not participate to layout of their parent.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/feature-detection.js"></script>
<script src="/mathml/support/layout-comparison.js"></script>
<script src="/mathml/support/mathml-fragments.js"></script>
<script>
var epsilon = 1;
setup({ explicit_done: true });
window.addEventListener("load", runTests);
function runTests() {
for (tag in MathMLFragments) {
if (!FragmentHelper.isValidChildOfMrow(tag) ||
FragmentHelper.isEmpty(tag))
continue;
["display: none",
"display: contents",
"position: absolute",
"position: fixed"
].forEach(style => {
document.body.insertAdjacentHTML("beforeend", `<div style="position: absolute;">\
<div style="display: inline-block"><math>${MathMLFragments[tag]}</math></div>\
<div style="display: inline-block"><math>${MathMLFragments[tag]}</math></div>\
</div>`);
var div = document.body.lastElementChild;
var elementContainer = div.firstElementChild;
var elementContainerWidth = elementContainer.getBoundingClientRect().width;
var element = FragmentHelper.element(elementContainer);
if (style === "display: contents" &&
!element.classList.contains("mathml-container")) {
// A "display: contents" MathML child is not participating to
// parent layout because its computed style is "display: none".
// If we cannot append a MathML child then skip that test.
return;
}
FragmentHelper.forceNonEmptyElement(element);
var allowInvalid = true;
var child = FragmentHelper.appendChild(element, allowInvalid);
child.setAttribute("style", style);
var referenceContainer = div.lastElementChild;
var referenceContainerWidth = referenceContainer.getBoundingClientRect().width;
var reference = FragmentHelper.element(referenceContainer);
FragmentHelper.forceNonEmptyElement(reference);
test(function() {
assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
assert_approx_equals(elementContainerWidth, referenceContainerWidth, epsilon);
}, `${tag} preferred width calculation is not affected by children with "${style}" style`);
test(function() {
assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
compareLayout(element, reference, epsilon);
}, `${tag} layout is not affected by children with "${style}" style`);
div.style = "display: none;"; // Hide the div after measurement.
});
}
done();
}
</script>
</head>
<body>
<div id="log"></div>
</body>
</html>
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