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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Fraction/Stack parameters (fallback)</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#fractions-mfrac">
<meta name="assert" content="Element mfrac correctly uses the fraction fallback parameters.">
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<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>
<style>
/* Testing fallback values is tricky as we don't have a lot of flexibility to
make sure one parameter is not shadowed by another one. We also use the
Ahem font here, so can't really play with the fallback values involved. */
math, mspace {
font-size: 200px; /* Large value because underlineThickness is small */
}
math {
/* OS/2.sxHeight = 800 */
/* post.underlineThickness == 20 */
font-family: Ahem;
}
</style>
<script>
const emToPx = 200 / 1000; // font-size: 200px, font.em = 1000
const epsilon = 1;
const xHeight = 800;
const underlineThickness = 20;
// NB: This test assumes the fallback shifts are all equal to zero.
const axisHeight = xHeight / 2;
const fractionRuleThickness = underlineThickness;
const fractionNumeratorGapMin = underlineThickness;
const fractionDenominatorGapMin = underlineThickness;
const fractionNumeratorDisplayStyleGapMin = 3 * underlineThickness;
const fractionDenominatorDisplayStyleGapMin = 3 * underlineThickness;
const stackGapMin = 3 * underlineThickness;
const stackDisplayStyleGapMin = 7 * underlineThickness;
function getBox(aId) {
return document.getElementById(aId).getBoundingClientRect();
}
setup({ explicit_done: true });
window.addEventListener("load", () => { loadAllFonts().then(runTests); });
function runTests() {
test(function() {
assert_true(MathMLFeatureDetection.has_mspace());
assert_approx_equals(axisHeight * emToPx,
(getBox("ref0001").top -
getBox("num0001").bottom) -
(fractionRuleThickness/2 +
fractionNumeratorGapMin) * emToPx,
epsilon);
assert_approx_equals((getBox("den0002").top -
getBox("num0002").bottom),
(fractionNumeratorGapMin +
fractionRuleThickness +
fractionDenominatorGapMin) * emToPx,
epsilon);
}, "nonzero linethickness, displaystyle=false");
test(function() {
assert_true(MathMLFeatureDetection.has_mspace());
assert_approx_equals(axisHeight * emToPx,
(getBox("ref0003").top -
getBox("num0003").bottom) -
(fractionRuleThickness/2 +
fractionNumeratorDisplayStyleGapMin) * emToPx,
epsilon, "mfrac: thickness, axis height");
assert_approx_equals((getBox("den0004").top -
getBox("num0004").bottom),
(fractionNumeratorDisplayStyleGapMin +
fractionRuleThickness +
fractionDenominatorDisplayStyleGapMin) * emToPx,
epsilon);
}, "nonzero linethickness, displaystyle=true");
test(function() {
assert_true(MathMLFeatureDetection.has_mspace());
assert_approx_equals((getBox("ref1001").top -
getBox("num1001").bottom),
stackGapMin/2 * emToPx,
epsilon);
assert_approx_equals((getBox("den1001").top) -
getBox("ref1001").top,
stackGapMin/2 * emToPx,
epsilon);
}, "linethickness=0, displaystyle=false");
test(function() {
assert_true(MathMLFeatureDetection.has_mspace());
assert_approx_equals((getBox("ref1002").top -
getBox("num1002").bottom),
stackDisplayStyleGapMin/2 * emToPx,
epsilon);
assert_approx_equals((getBox("den1002").top) -
getBox("ref1002").top,
stackDisplayStyleGapMin/2 * emToPx,
epsilon);
}, "linethickness=0, displaystyle=true");
done();
}
</script>
</head>
<body>
<div id="log"></div>
<p>
<math>
<mspace id="ref0001" height="0em" depth="1em" width="1em" style="background: green"/>
<mfrac>
<mspace width="1em" height="2em" depth="0em" id="num0001" style="background: blue"/>
<mspace width="1em" height="0em" depth="2em" id="den0001" style="background: purple"/>
</mfrac>
</math>
</p>
<p>
<math>
<mfrac>
<mspace width="1em" height="2em" depth="4em" id="num0002" style="background: blue"/>
<mspace width="1em" height="4em" depth="2em" id="den0002" style="background: purple"/>
</mfrac>
</math>
</p>
<hr/>
<p>
<math displaystyle="true">
<mspace id="ref0003" height="0em" depth="1em" width="1em" style="background: green"/>
<mfrac>
<mspace width="1em" height="2em" depth="0em" id="num0003" style="background: blue"/>
<mspace width="1em" height="0em" depth="2em" id="den0003" style="background: purple"/>
</mfrac>
</math>
</p>
<p>
<math displaystyle="true">
<mfrac>
<mspace width="1em" height="2em" depth="4em" id="num0004" style="background: blue"/>
<mspace width="1em" height="4em" depth="2em" id="den0004" style="background: purple"/>
</mfrac>
</math>
</p>
<hr/>
<p>
<math>
<mspace id="ref1001" height="0em" depth="1em" width="1em" style="background: green"/>
<mfrac linethickness="0">
<mspace width="1em" height="2em" depth="0em" id="num1001" style="background: blue"/>
<mspace width="1em" height="0em" depth="2em" id="den1001" style="background: purple"/>
</mfrac>
</math>
</p>
<hr/>
<p>
<math displaystyle="true">
<mspace id="ref1002" height="0em" depth="1em" width="1em" style="background: green"/>
<mfrac linethickness="0">
<mspace width="1em" height="2em" depth="0em" id="num1002" style="background: blue"/>
<mspace width="1em" height="0em" depth="2em" id="den1002" style="background: purple"/>
</mfrac>
</math>
</p>
</body>
</html>
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