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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Test mrow fallback for some MathML elements (preferred logical widths)</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#script-and-limit-schemata">
<meta name="assert" content="Verify that invalid markup fallbacks to mrow behaviour when computing preferred logical widths.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/feature-detection.js"></script>
<script src="/mathml/support/fonts.js"></script>
<script src="/mathml/support/layout-comparison.js"></script>
<script src="/mathml/support/mathml-fragments.js"></script>
<script src="/mathml/support/invalid-markup.js"></script>
<style>
/* Revert style specified in the UA style sheet that changes box size. */
mfrac { padding-inline: 0; }
</style>
<script>
setup({ explicit_done: true });
window.addEventListener("load", () => { loadAllFonts().then(runTests); });
function wrapShrink(el) {
let wrapper = document.createElement("div");
let math = FragmentHelper.createElement("math");
wrapper.style.display = "inline-block";
math.appendChild(el);
wrapper.appendChild(math);
return wrapper;
}
function runTests() {
let container = document.getElementById("container");
let invalidMarkup = generateInvalidMarkup();
const epsilon = 1;
for (let math of invalidMarkup.children) {
let element = math.firstElementChild;
let reference = element.nextElementSibling;
let description = element.dataset.description;
// generateInvalidMarkup() puts both the element and the reference in the same <math>.
// To test preferred logical widths, we need to separate them out under different divs.
let elementWrapper = wrapShrink(element);
let referenceWrapper = wrapShrink(reference);
container.append(elementWrapper, referenceWrapper);
test(function() {
assert_approx_equals(elementWrapper.getBoundingClientRect().width, referenceWrapper.getBoundingClientRect().width, epsilon);
}, `Invalid <${element.tagName}> should fallback to mrow behaviour when computing preferred logical widths (${description})`);
}
done();
}
</script>
</head>
<body>
<div id="log"></div>
<div id="container"></div>
</body>
</html>
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