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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Dynamic childlist of MathML elements</title>
<script src="/mathml/support/mathml-fragments.js"></script>
<link rel="help" href="https://w3c.github.io/mathml-core/#adjust-space-around-content-mpadded">
<link rel="help" href="https://w3c.github.io/mathml-core/#dom-and-javascript">
<meta name="assert" content="Dynamically modify DOM tree of some MathML elements by adding or removing children.">
<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>
function generateMathForTag(tag, childCount) {
let math = FragmentHelper.createElement("math");
let element = FragmentHelper.createElement(tag);
// Add the children with different sizes at odd positions and OOF
// mrow at even position.
for (let i = 0; i < childCount; i++) {
if (i % 2) {
let mspace = FragmentHelper.createElement("mspace");
mspace.setAttribute("width", `10px`);
mspace.setAttribute("height", `${10*(i+1)}px`);
mspace.setAttribute("style", `background: black;`);
element.appendChild(mspace);
} else {
let mrow = FragmentHelper.createElement("mrow");
mrow.setAttribute("style", "position: absolute");
element.appendChild(mrow);
}
}
if (FragmentHelper.isValidChildOfMrow(tag)) {
math.appendChild(element);
} else if (tag === "mtd") {
let mtr = FragmentHelper.createElement("mtr");
mtr.appendChild(element);
let mtable = FragmentHelper.createElement("mtable");
mtable.appendChild(mtr);
math.appendChild(mtable);
} else {
throw `Invalid argument: ${tag}`;
}
return math;
}
setup({ explicit_done: true });
window.addEventListener("load", function() {
for (tag in MathMLFragments) {
if (!FragmentHelper.isValidChildOfMrow(tag) || tag === "mtd")
continue;
document.body.insertAdjacentHTML("beforeend", `<div style='display: none; background: pink;'>${tag}: <div></div><div></div><div></div></div>`);
let container = document.body.lastElementChild;
let referenceDiv = container.children[0];
const maxChild = 10;
const epsilon = 1;
// Create the references for different number of children as well
// as the element that will get the children added / removed.
for (let i = 0; i <= maxChild; i++)
referenceDiv.append(generateMathForTag(tag, i));
let fullReferenceMath = referenceDiv.lastElementChild;
let fullReferenceTag = fullReferenceMath.firstElementChild;
let removeChildrenMath = generateMathForTag(tag, maxChild);
container.children[1].append(removeChildrenMath);
let removeChildrenTag = removeChildrenMath.firstElementChild;
let appendChildrenMath = generateMathForTag(tag, 0);
container.children[2].append(appendChildrenMath);
let appendChildrenTag = appendChildrenMath.firstElementChild;
// Make content visible after the DOM is ready so that the layout
// only happens now.
container.style.display = "block";
test(function() {
assert_true(MathMLFeatureDetection.has_mspace());
assert_true(MathMLFeatureDetection[`has_${tag}`]());
for (let i = 0; i < maxChild; i++) {
// append and remove children.
appendChildrenTag.append(fullReferenceTag.children[i].cloneNode(true));
removeChildrenTag.removeChild(removeChildrenTag.lastElementChild);
// force layout so we're sure what we're testing against
container.getBoundingClientRect();
let appendCount = appendChildrenTag.children.length;
let removeCount = removeChildrenTag.children.length;
if (tag == "mspace") {
compareSize(appendChildrenTag, referenceDiv.children[appendCount].firstElementChild, epsilon);
childrenHaveEmptyBoundingClientRects(appendChildrenTag);
childrenHaveEmptyBoundingClientRects(referenceDiv.children[appendCount].firstElementChild);
childrenHaveEmptyBoundingClientRects(removeChildrenTag);
childrenHaveEmptyBoundingClientRects(referenceDiv.children[removeCount].firstElementChild);
} else {
compareLayout(appendChildrenTag, referenceDiv.children[appendCount].firstElementChild, epsilon, `appending ${appendCount}-th child`);
compareLayout(removeChildrenTag, referenceDiv.children[removeCount].firstElementChild, epsilon, `removing ${appendCount + 1}-th child`);
}
}
// Hide back the div after successful testing.
container.style.display = "none";
}, `Appending and removing children to ${tag}`);
}
done();
});
</script>
</head>
<body>
<div id="log"></div>
</body>
</html>
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