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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /mathml/presentation-markup/mrow/mrow-fallback.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Test mrow fallback for some MathML elements</title>
<meta name="assert" content="Verify that invalid markup fallbacks to row layout.">
<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>
setup({ explicit_done: true });
window.addEventListener("load", () => { loadAllFonts().then(runTests); });
function isValid(tagName, mspaceCount) {
switch (tagName) {
case "mfrac":
case "mroot":
case "munder":
case "mover":
case "msub":
case "msup":
return mspaceCount == 2;
case "munderover":
case "msubsup":
return mspaceCount == 3;
case "mmultiscripts":
return mspaceCount % 2 == 1;
}
}
function runTests() {
let container = document.getElementById("container");
const epsilon = 1;
["mfrac", "mroot", "munder", "mover", "munderover", "msub", "msup", "msubsup", "mmultiscripts"].forEach(tag => {
let element = FragmentHelper.createElement(tag);
let reference = FragmentHelper.createElement("mrow");
container.appendChild(element);
container.appendChild(reference);
let maxCount = tag == "mmultiscripts" ? 10 : 5;
let mspaceCount = 0;
for (let count = 0; count <= maxCount; count++) {
if (!isValid(tag, mspaceCount)) {
test(function() {
compareLayout(element, reference, epsilon);
}, `Invalid <${element.tagName}> should lay out as an mrow (count == ${count})`);
}
if (tag == "mmultiscripts" && count == maxCount / 2) {
[element, reference].forEach(el => {
el.insertAdjacentHTML("beforeend", `<mprescripts/>`);
});
} else {
let width = (count + 1) * 10;
let height = (count + 1) * (count % 2 ? 15 : 5);
let depth = (count + 1) * (count % 2 ? 5 : 15);
[element, reference].forEach(el => {
el.insertAdjacentHTML("beforeend", `<mspace height="${height}px" depth="${depth}px" width="${width}px" style="background: black"/>`);
});
mspaceCount++;
}
}
});
Array.from(document.getElementById("invalidMultiscripts").
getElementsByTagName("mmultiscripts")).forEach(element => {
let reference = element.nextElementSibling;
let description = element.dataset.description;
test(function() {
compareLayout(element, reference, epsilon);
}, `Invalid mmultiscripts should lay out as an mrow (${description})`);
});
done();
}
</script>
</head>
<body>
<div id="log"></div>
<div id="container"></div>
<div id="invalidMultiscripts">
<math>
<mmultiscripts data-description="first in-flow child is an <mprescripts>">
<mprescripts/>
<mspace height="5px" depth="15px" width="10px" style="background: black"/>
<mspace height="30px" depth="10px" width="20px" style="background: black"/>
<mspace height="15px" depth="45px" width="30px" style="background: black"/>
<mspace height="60px" depth="20px" width="40px" style="background: black"/>
</mmultiscripts>
<mrow>
<mprescripts/>
<mspace height="5px" depth="15px" width="10px" style="background: black"/>
<mspace height="30px" depth="10px" width="20px" style="background: black"/>
<mspace height="15px" depth="45px" width="30px" style="background: black"/>
<mspace height="60px" depth="20px" width="40px" style="background: black"/>
</mrow>
</math>
<math>
<mmultiscripts data-description="one of the even number of children after the first <mprescripts> is an <mprescripts>">
<mspace height="5px" depth="15px" width="10px" style="background: black"/>
<mspace height="30px" depth="10px" width="20px" style="background: black"/>
<mspace height="15px" depth="45px" width="30px" style="background: black"/>
<mprescripts/>
<mspace height="60px" depth="20px" width="40px" style="background: black"/>
<mprescripts/>
<mspace height="25px" depth="75px" width="50px" style="background: black"/>
<mspace height="35px" depth="105px" width="70px" style="background: black"/>
</mmultiscripts>
<mrow>
<mspace height="5px" depth="15px" width="10px" style="background: black"/>
<mspace height="30px" depth="10px" width="20px" style="background: black"/>
<mspace height="15px" depth="45px" width="30px" style="background: black"/>
<mprescripts/>
<mspace height="60px" depth="20px" width="40px" style="background: black"/>
<mprescripts/>
<mspace height="25px" depth="75px" width="50px" style="background: black"/>
<mspace height="35px" depth="105px" width="70px" style="background: black"/>
</mrow>
</math>
</div>
</body>
</html>