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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /mathml/presentation-markup/operators/operator-dictionary-combining-default.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Operator dictionary (combining char, default category)</title>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<link rel="stylesheet" href="./support/operator-dictionary-tests.css"/>
<meta name="assert" content="Operators with unsupported combining characters or three or more characters fall back to Default category (lspace=rspace=0.2777777777777778em)">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/feature-detection.js"></script>
<style>
mo {
color: blue;
}
mn {
background: black;
}
</style>
<script>
function spaceBetween(element, i, j) {
return element.children[j].getBoundingClientRect().left -
element.children[i].getBoundingClientRect().right;
}
window.addEventListener("load", () => {
var epsilon = 1;
// Default category spacing per https://w3c.github.io/mathml-core/#operator-dictionary-categories-values
var defaultSpaceEm = 0.2777777777777778;
Array.from(document.getElementsByClassName("test-group")).forEach(group => {
var ref = group.getElementsByClassName("reference")[0];
var def = group.getElementsByClassName("default")[0];
test(function() {
assert_true(MathMLFeatureDetection.has_operator_spacing());
var fontSize = parseFloat(getComputedStyle(def).fontSize);
var expected = 2 * defaultSpaceEm * fontSize;
var actual = spaceBetween(def, 0, 2) - spaceBetween(ref, 0, 2);
assert_approx_equals(actual, expected, epsilon, "lspace + rspace");
}, `Default spacing for ${group.dataset.description}`);
});
});
</script>
</head>
<body>
<div id="log"></div>
<!-- U+0303 COMBINING TILDE is not a recognized combining overlay -->
<div class="test-group" data-description="= + unsupported combining char U+0303">
<p>
<math class="reference">
<mn> </mn>
<mo lspace="0" rspace="0">=̃</mo>
<mn> </mn>
</math>
</p>
<p>
<math class="default">
<mn> </mn>
<mo>=̃</mo>
<mn> </mn>
</math>
</p>
</div>
<!-- Three characters: base + two combining overlays -->
<div class="test-group" data-description="= + U+0338 + U+20D2 (too many characters)">
<p>
<math class="reference">
<mn> </mn>
<mo lspace="0" rspace="0">≠⃒</mo>
<mn> </mn>
</math>
</p>
<p>
<math class="default">
<mn> </mn>
<mo>≠⃒</mo>
<mn> </mn>
</math>
</p>
</div>
</body>
</html>