<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Subscripts and Superscripts parameters</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#subscripts-and-superscripts-msub-msup-msubsup">
<meta name="assert" content="Elements msub, msup, subsup and msubsup correctly use the italic correction from the MATH table.">
<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>
math, mspace {
font-size: 10px;
}
@font-face {
font-family: largeop-displayoperatorminheight5000;
src: url("/fonts/math/largeop-displayoperatorminheight5000.woff");
}
@font-face {
font-family: largeop-displayoperatorminheight2000-2AFF-italiccorrection3000;
src: url("/fonts/math/largeop-displayoperatorminheight2000-2AFF-italiccorrection3000.woff");
}
@font-face {
font-family: largeop-displayoperatorminheight7000-2AFF-italiccorrection5000;
src: url("/fonts/math/largeop-displayoperatorminheight7000-2AFF-italiccorrection5000.woff");
}
</style>
<script>
function getBox(aId) {
return document.getElementById(aId).getBoundingClientRect();
}
setup({ explicit_done: true });
window.addEventListener("load", () => { loadAllFonts().then(runTests); });
/*
These two tests verify that:
- In msub, the script is at the right of the base minus the italic correction.
- In msup, the script is just at the right of the base.
- In msubsup, the scripts are shifted by the italic correction.
- In mmultiscripts, postscript pairs are shifted by the italic correction.
- In mmultiscripts, prescript pairs are vertically aligned.
*/
var epsilon = 1;
var emToPx = 10 / 1000; // font-size: 10px, font.em = 1000
function runTests() {
test(function() {
assert_true(MathMLFeatureDetection.has_mspace());
var v = 0;
assert_approx_equals(getBox("base001").right - getBox("sub001").left, v, epsilon, "msub");
assert_approx_equals(getBox("sup002").left, getBox("base002").right, epsilon, "msup");
assert_approx_equals(getBox("sup003").left - getBox("sub003").left, v, epsilon, "msubsup");
assert_approx_equals(getBox("sup004").left - getBox("sub004").left, v, epsilon, "mmultiscripts postscripts");
assert_approx_equals(getBox("sup005").left - getBox("sub005").left, 0, epsilon, "mmultiscripts prescripts");
}, "Null Italic Correction");
test(function() {
assert_true(MathMLFeatureDetection.has_mspace());
var v = 3000 * emToPx;
assert_approx_equals(getBox("base011").right - getBox("sub011").left, v, epsilon, "msub");
assert_approx_equals(getBox("sup012").left, getBox("base012").right, epsilon, "msup");
assert_approx_equals(getBox("sup013").left - getBox("sub013").left, v, epsilon, "msubsup");
assert_approx_equals(getBox("sup014").left - getBox("sub014").left, v, epsilon, "mmultiscripts postscripts");
assert_approx_equals(getBox("sup015").left - getBox("sub015").left, 0, epsilon, "mmultiscripts prescripts");
}, "NonNull Italic Correction (MathGlyphVariantRecord)");
test(function() {
assert_true(MathMLFeatureDetection.has_mspace());
var v = 5000 * emToPx;
assert_approx_equals(getBox("base021").right - getBox("sub021").left, v, epsilon, "msub");
assert_approx_equals(getBox("sup022").left, getBox("base022").right, epsilon, "msup");
assert_approx_equals(getBox("sup023").left - getBox("sub023").left, v, epsilon, "msubsup");
assert_approx_equals(getBox("sup024").left - getBox("sub024").left, v, epsilon, "mmultiscripts postscripts");
assert_approx_equals(getBox("sup025").left - getBox("sub025").left, 0, epsilon, "mmultiscripts prescripts");
}, "NonNull Italic Correction (GlyphAssembly)");
done();
}
</script>
</head>
<body>
<div id="log"></div>
<h2>Null Italic Correction</h2>
<p>
<math displaystyle="true" style="font-family: largeop-displayoperatorminheight5000;">
<msub>
<mo id="base001" lspace="0px" rspace="0px">⫿</mo>
<mspace id="sub001" height="1em" width="1em" style="background: blue"/>
</msub>
</math>
<math displaystyle="true" style="font-family: largeop-displayoperatorminheight5000;">
<msup>
<mo id="base002" lspace="0px" rspace="0px">⫿</mo>
<mspace id="sup002" height="1em" width="1em" style="background: blue"/>
</msup>
</math>
<math displaystyle="true" style="font-family: largeop-displayoperatorminheight5000;">
<msubsup>
<mo lspace="0px" rspace="0px">⫿</mo>
<mspace id="sub003" height="1em" width="1em" style="background: blue"/>
<mspace id="sup003" height="1em" width="1em" style="background: green"/>
</msubsup>
</math>
<math displaystyle="true" style="font-family: largeop-displayoperatorminheight5000;">
<mmultiscripts>
<mo lspace="0px" rspace="0px">⫿</mo>
<mspace id="sub004" height="1em" width="1em" style="background: blue"/>
<mspace id="sup004" height="1em" width="1em" style="background: green"/>
<mprescripts/>
<mspace id="sub005" height="1em" width="1em" style="background: magenta"/>
<mspace id="sup005" height="1em" width="1em" style="background: cyan"/>
</mmultiscripts>
</math>
</p>
<h2>NonNull Italic Correction (MathGlyphVariantRecord)</h2>
<p>
<math displaystyle="true" style="font-family: largeop-displayoperatorminheight2000-2AFF-italiccorrection3000;">
<msub>
<mo id="base011" lspace="0px" rspace="0px">⫿</mo>
<mspace id="sub011" height="1em" width="1em" style="background: blue"/>
</msub>
</math>
<math displaystyle="true" style="font-family: largeop-displayoperatorminheight2000-2AFF-italiccorrection3000;">
<msup>
<mo id="base012" lspace="0px" rspace="0px">⫿</mo>
<mspace id="sup012" height="1em" width="1em" style="background: blue"/>
</msup>
</math>
<math displaystyle="true" style="font-family: largeop-displayoperatorminheight2000-2AFF-italiccorrection3000;">
<msubsup>
<mo lspace="0px" rspace="0px">⫿</mo>
<mspace id="sub013" height="1em" width="1em" style="background: blue"/>
<mspace id="sup013" height="1em" width="1em" style="background: green"/>
</msubsup>
</math>
<math displaystyle="true" style="font-family: largeop-displayoperatorminheight2000-2AFF-italiccorrection3000;">
<mmultiscripts>
<mo lspace="0px" rspace="0px">⫿</mo>
<mspace id="sub014" height="1em" width="1em" style="background: blue"/>
<mspace id="sup014" height="1em" width="1em" style="background: green"/>
<mprescripts/>
<mspace id="sub015" height="1em" width="1em" style="background: magenta"/>
<mspace id="sup015" height="1em" width="1em" style="background: cyan"/>
</mmultiscripts>
</math>
</p>
<h2>NonNull Italic Correction (GlyphAssembly)</h2>
<p>
<math displaystyle="true" style="font-family: largeop-displayoperatorminheight7000-2AFF-italiccorrection5000;">
<msub>
<mo id="base021" lspace="0px" rspace="0px">⫿</mo>
<mspace id="sub021" height="1em" width="1em" style="background: blue"/>
</msub>
</math>
<math displaystyle="true" style="font-family: largeop-displayoperatorminheight7000-2AFF-italiccorrection5000;">
<msup>
<mo id="base022" lspace="0px" rspace="0px">⫿</mo>
<mspace id="sup022" height="1em" width="1em" style="background: blue"/>
</msup>
</math>
<math displaystyle="true" style="font-family: largeop-displayoperatorminheight7000-2AFF-italiccorrection5000;">
<msubsup>
<mo lspace="0px" rspace="0px">⫿</mo>
<mspace id="sub023" height="1em" width="1em" style="background: blue"/>
<mspace id="sup023" height="1em" width="1em" style="background: green"/>
</msubsup>
</math>
<math displaystyle="true" style="font-family: largeop-displayoperatorminheight7000-2AFF-italiccorrection5000;">
<mmultiscripts>
<mo lspace="0px" rspace="0px">⫿</mo>
<mspace id="sub024" height="1em" width="1em" style="background: blue"/>
<mspace id="sup024" height="1em" width="1em" style="background: green"/>
<mprescripts/>
<mspace id="sub025" height="1em" width="1em" style="background: magenta"/>
<mspace id="sup025" height="1em" width="1em" style="background: cyan"/>
</mmultiscripts>
</math>
</p>
</body>
</html>
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