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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>absolutely positioned in all MathML elements</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#layout-algorithms">
<meta name="assert" content="Verify that absolutely positioned node works in all MathML elements.">
<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>
<style>
/* override display: none on children of maction/semantics */
maction > *, semantics > * {
display: math;
}
</style>
<script>
setup({ explicit_done: true });
window.addEventListener("load", runTests);
function runTests() {
["absolute", "fixed"].forEach(positionValue => {
for (tag in MathMLFragments) {
if (!FragmentHelper.isValidChildOfMrow(tag) ||
FragmentHelper.isEmpty(tag))
continue;
document.body.insertAdjacentHTML("beforeend", `<div style="position: absolute;">\
<math>${MathMLFragments[tag]}</math>\
</div>`);
let div = document.body.lastElementChild;
let element = FragmentHelper.element(div.firstElementChild);
FragmentHelper.forceNonEmptyElement(element);
if (element.classList.contains("mathml-container") ||
element.classList.contains("foreign-container")) {
for (let i = 0; i < 5; i++) {
FragmentHelper.appendChild(element);
}
}
let middleChild;
if (element.children.length >= 2) {
middleChild = FragmentHelper.appendChild(element, true /*allowInvalid*/);
middleChild.setAttribute("style", `position: ${positionValue}; left: 300px; top: 400px`);
let middlePosition = Math.floor(element.children.length/2);
element.insertBefore(middleChild, element.children[middlePosition]);
}
let firstChild = FragmentHelper.appendChild(element, true /*allowInvalid*/);
firstChild.setAttribute("style", `position: ${positionValue}; left: 100px; top: 200px`);
element.insertBefore(firstChild, element.firstElementChild);
let lastChild = FragmentHelper.appendChild(element, true /*allowInvalid*/);
lastChild.setAttribute("style", `position: ${positionValue}; left: 500px; top: 600px`);
let referenceBox;
switch (positionValue) {
case "absolute":
// Use the absolutely positioned div ancestor.
referenceBox = div.getBoundingClientRect();
break
case "fixed":
// Use the viewport.
referenceBox = {left: 0, top: 0};
break;
default:
throw "reference box not defined";
}
let firstChildBox = firstChild.getBoundingClientRect();
let lastChildBox = lastChild.getBoundingClientRect();
let middleChildBox;
if (middleChild) {
middleChildBox = middleChild.getBoundingClientRect();
}
let epsilon = 1;
test(function() {
assert_true(MathMLFeatureDetection[`has_${tag}`](), `${tag} is supported`);
assert_approx_equals(firstChildBox.left - referenceBox.left, 100, epsilon);
assert_approx_equals(firstChildBox.top - referenceBox.top, 200, epsilon);
if (middleChildBox) {
assert_approx_equals(middleChildBox.left - referenceBox.left, 300, epsilon);
assert_approx_equals(middleChildBox.top - referenceBox.top, 400, epsilon);
}
assert_approx_equals(lastChildBox.left - referenceBox.left, 500, epsilon);
assert_approx_equals(lastChildBox.top - referenceBox.top, 600, epsilon);
}, `position: ${positionValue}; children in ${tag}`);
div.style = "display: none;"; // Hide the div after measurement.
}
});
done();
}
</script>
</head>
<body>
<div id="log"></div>
</body>
</html>
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