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<!DOCTYPE html>
<html class="reftest-wait">
<head>
<meta charset="utf-8">
<title>Stack parameters (display gap between numerator and denominator)</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#fractions-mfrac">
<link rel="match" href="frac-parameters-gap-006-ref.html"/>
<meta name="assert" content="Element mfrac with zero linethickness correctly uses the StackGapMin parameter from the MATH table when denominator contains text.">
<style>
math, mspace, mtext {
font-size: 20px;
}
mtext {
font-family: math-text;
color: blue;
}
@font-face {
font-family: gapmin8000;
src: url("/fonts/math/stack-gapmin8000.woff");
}
@font-face {
/*
math-text has the following properties:
- typo/hhea/win metrics: 2.5em ascent and 2.5em descent.
- glyph A: .5em ascent and .5em descent.
- glyph B: 1em ascent and 0em descent.
- glyph C: 0em ascent and 1em descent.
*/
font-family: math-text;
src: url("/fonts/math/math-text.woff");
}
#reference {
background: green;
}
#frame {
position: absolute;
border-top: 4px solid black;
border-bottom: 4px solid black;
width: 100%;
}
</style>
<script src="/mathml/support/fonts.js"></script>
<script>
function runTests() {
var div = document.getElementById("frame");
var refBox = document.getElementById("reference").getBoundingClientRect();
div.style.top = `${refBox.top-2}px`;
div.style.height = `${refBox.height-4}px`;
document.documentElement.classList.remove('reftest-wait');
}
window.addEventListener("load", () => { loadAllFonts().then(runTests); });
</script>
</head>
<body>
<p>
This test passes if the blue squares are aligned:
</p>
<p>
<math style="font-family: gapmin8000">
<!-- This is a dummy mspace element to ensure that the font ascent/descent does not affect the size of the math element. -->
<mspace height="10em" depth="10em"/>
<!--
The gap between the numerators/denominators and the math axis must StackGapMin / 2.
The gap should be calculated using the exact bounding box of the glyphs.
The numerator descent is .5em + the denominator ascent.
Hence glyphs A, B, C should be rendered at the same vertical position, even if they have different ascent/descent.
-->
<mfrac linethickness="0px">
<mspace width="3em" depth="1em"/>
<mspace id="reference" width="3em" height=".5em" depth=".5em"/>
</mfrac>
<mfrac linethickness="0px">
<mspace width="3em" depth="1em"/>
<mtext>A</mtext>
</mfrac>
<mfrac linethickness="0px">
<mspace width="3em" depth="1.5em"/>
<mtext>B</mtext>
</mfrac>
<mfrac linethickness="0px">
<mspace width="3em" depth=".5em"/>
<mtext>C</mtext>
</mfrac>
</math>
</p>
<div id="frame"></div>
<script src="/mathml/support/feature-detection.js"></script>
<script>MathMLFeatureDetection.ensure_for_match_reftest("has_mfrac");</script>
</body>
</html>
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