<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Embellished operators - tree change and relayout</title>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<link rel="help" href="https://w3c.github.io/mathml-core/#embellished-operators">
<link rel="help" href="https://w3c.github.io/mathml-core/#definition-of-space-like-elements">
<link rel="help" href="https://w3c.github.io/mathml-core/#layout-of-mrow">
<link rel="help" href="https://chromium-review.googlesource.com/c/chromium/src/+/3059456">
<meta name="assert" content="Verify relayout of an mrow with a child that has a deeply nested <mo> element.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/mathml-fragments.js"></script>
<script src="/mathml/support/fonts.js"></script>
<style>
math, math * {
font: 25px/1 Ahem;
}
mn {
color: black;
}
.relative_positioned_and_fixed_size {
position: relative;
height: 0px;
width: 0px;
overflow: scroll;
}
</style>
<script>
setup({ explicit_done: true });
window.addEventListener("load", () => { loadAllFonts().then(runTests); });
function runTests() {
var epsilon = 1;
var emToPx = 25;
function assertCorrectSpacing(container,
zero_size_mrow_is_embellished_op) {
// The container should add lspace/rspace around the zero size mrow
// if and only if that mrow is an embellished operator.
let mnBefore = container.children[0].getBoundingClientRect();
let zeroSizeMrow = container.children[1].getBoundingClientRect();
let mnAfter = container.children[2].getBoundingClientRect();
assert_approx_equals(zeroSizeMrow.left - mnBefore.right,
zero_size_mrow_is_embellished_op ?
emToPx * 1 : 0, epsilon,
"lspace");
assert_approx_equals(mnAfter.left - zeroSizeMrow.right,
zero_size_mrow_is_embellished_op ?
emToPx * 2 : 0, epsilon,
"rspace");
}
let container1 = document.getElementById("container1");
test(function() {
assertCorrectSpacing(container1, true);
}, "container1: Initially an embellished operator");
let container2 = document.getElementById("container2");
test(function() {
assertCorrectSpacing(container2, false);
}, "container2: Initially not an embellished operator");
test(function() {
let mrow1 = document.getElementById("change_to_not_embellished_operator");
mrow1.appendChild(FragmentHelper.createElement("mn"));
assertCorrectSpacing(container1, false);
}, " container1: No longer an embellished operator");
test(function() {
let mrow2 = document.getElementById("change_to_embellished_operator");
mrow2.removeChild(mrow2.lastElementChild);
assertCorrectSpacing(container2, true);
}, "container2: Became an embellished operator");
let container3 = document.getElementById("container3");
test(function() {
assertCorrectSpacing(container3, true);
}, "container3: Initially an embellished operator (testing space-like)");
let container4 = document.getElementById("container4");
test(function() {
assertCorrectSpacing(container4, false);
}, "container4/space-like: Initially not an embellished operator (testing space-like)");
test(function() {
let mrow = document.getElementById("change_to_not_space_like");
mrow.appendChild(FragmentHelper.createElement("mn"));
assertCorrectSpacing(container3, false);
}, " container3: No longer an embellished operator (testing space-like)");
test(function() {
let mrow = document.getElementById("change_to_space_like");
mrow.removeChild(mrow.lastElementChild);
assertCorrectSpacing(container4, true);
}, "container4: Became an embellished operator (testing space-like)");
done();
}
</script>
</head>
<body>
<div id="log"></div>
<div>
<math display="block">
<mrow id="container1">
<mn>1</mn>
<mrow class="relative_positioned_and_fixed_size">
<mrow id="change_to_not_embellished_operator">
<mrow>
<mo lspace="1em" rspace="2em"></mo>
</mrow>
</mrow>
</mrow>
<mn>2</mn>
</mrow>
</math>
</div>
<div>
<math display="block">
<mrow id="container2">
<mn>3</mn>
<mrow class="relative_positioned_and_fixed_size">
<mrow id="change_to_embellished_operator">
<mrow>
<mo lspace="1em" rspace="2em"></mo>
</mrow>
<mn></mn>
</mrow>
</mrow>
<mn>4</mn>
</mrow>
</math>
</div>
<div>
<math display="block">
<mrow id="container3">
<mn>5</mn>
<mrow>
<mrow>
<mrow>
<mo lspace="1em" rspace="2em"></mo>
</mrow>
<mrow class="relative_positioned_and_fixed_size">
<mrow id="change_to_not_space_like">
<mspace></mspace>
<mtext></mtext>
</mrow>
</mrow>
</mrow>
</mrow>
<mn>6</mn>
</mrow>
</math>
</div>
<div>
<math display="block">
<mrow id="container4">
<mn>7</mn>
<mrow>
<mrow>
<mrow>
<mo lspace="1em" rspace="2em"></mo>
</mrow>
<mrow class="relative_positioned_and_fixed_size">
<mrow id="change_to_space_like">
<mspace></mspace>
<mtext></mtext>
<mn></mn>
</mrow>
</mrow>
</mrow>
</mrow>
<mn>8</mn>
</mrow>
</math>
</div>
</body>
</html>
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