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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Subscripts and Superscripts metrics</title>
<link rel="help" href="https://w3c.github.io/mathml-core/#subscripts-and-superscripts-msub-msup-msubsup">
<meta name="assert" content="Verify metrics of scripted elements for bases of different heights.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/feature-detection.js"></script>
<style>
math, mspace {
font-size: 10px;
}
</style>
<script>
/* This test does not use any specific fonts and so the exact rules are not
specified precisely. We assume reasonable values for script shifts and
spacing. */
function getBox(aId) {
var box = document.getElementById(aId).getBoundingClientRect();
box.middle = (box.bottom + box.top) / 2;
return box;
}
setup({ explicit_done: true });
window.addEventListener("load", runTests);
var sizeArray = [50, 75, 100];
function runTests() {
test(function() {
assert_true(MathMLFeatureDetection.has_mspace());
var e = 1;
sizeArray.forEach(function(size) {
assert_approx_equals(getBox("msub" + size + "base").middle, getBox("baseline").bottom, e, "msub base " + size + "is placed on the baseline");
assert_approx_equals(getBox("msup" + size + "base").middle, getBox("baseline").bottom, e, "msup base " + size + "is placed on the baseline");
assert_approx_equals(getBox("msubsup" + size + "base").middle, getBox("baseline").bottom, e, "msubsup base " + size + "is placed on the baseline");
assert_approx_equals(getBox("multi" + size + "base").middle, getBox("baseline").bottom, e, "mmultiscripts base " + size + "is placed on the baseline");
});
}, "Alignment on the baseline for bases of different heights");
test(function() {
assert_true(MathMLFeatureDetection.has_mspace());
var e = 5;
sizeArray.forEach(function(size) {
assert_approx_equals(getBox("msub" + size + "sub").middle, getBox("msub" + size + "base").bottom, e, "msub script " + size + "is placed at the top of of the base");
});
}, "Vertical position of the scripts for bases of different heights");
done();
}
</script>
</head>
<body>
<div id="log"></div>
<p>
<math>
<mspace id="baseline" width="30px" height="2px" depth="0px" style="background: blue"/>
<msub id="msub50">
<mspace id="msub50base" width="30px" height="50px" depth="50px" style="background: black"/>
<mspace id="msub50sub" width="10px" height="5px" depth="5px" style="background: black"/>
</msub>
<msup id="msup50">
<mspace id="msup50base" width="30px" height="50px" depth="50px" style="background: black"/>
<mspace id="msup50sup" width="10px" height="5px" depth="5px" style="background: black"/>
</msup>
<msubsup id="msubsup50">
<mspace id="msubsup50base" width="30px" height="50px" depth="50px" style="background: black"/>
<mspace id="msubsup50sub" width="10px" height="5px" depth="5px" style="background: black"/>
<mspace id="msubsup50sup" width="10px" height="5px" depth="5px" style="background: black"/>
</msubsup>
<mmultiscripts id="multi50">
<mspace id="multi50base" width="30px" height="50px" depth="50px" style="background: black"/>
<mspace id="multi50postsub" width="10px" height="5px" depth="5px" style="background: black"/>
<mspace id="multi50postsup" width="10px" height="5px" depth="5px" style="background: black"/>
<mprescripts/>
<mspace id="multi50presub" width="10px" height="5px" depth="5px" style="background: black"/>
<mspace id="multi50presup" width="10px" height="5px" depth="5px" style="background: black"/>
</mmultiscripts>
<msub id="msub75">
<mspace id="msub75base" width="30px" height="75px" depth="75px" style="background: black"/>
<mspace id="msub75sub" width="10px" height="5px" depth="5px" style="background: black"/>
</msub>
<msup id="msup75">
<mspace id="msup75base" width="30px" height="75px" depth="75px" style="background: black"/>
<mspace id="msup75sup" width="10px" height="5px" depth="5px" style="background: black"/>
</msup>
<msubsup id="msubsup75">
<mspace id="msubsup75base" width="30px" height="75px" depth="75px" style="background: black"/>
<mspace id="msubsup75sub" width="10px" height="5px" depth="5px" style="background: black"/>
<mspace id="msubsup75sup" width="10px" height="5px" depth="5px" style="background: black"/>
</msubsup>
<mmultiscripts id="multi75">
<mspace id="multi75base" width="30px" height="75px" depth="75px" style="background: black"/>
<mspace id="multi75postsub" width="10px" height="5px" depth="5px" style="background: black"/>
<mspace id="multi75postsup" width="10px" height="5px" depth="5px" style="background: black"/>
<mprescripts/>
<mspace id="multi75presub" width="10px" height="5px" depth="5px" style="background: black"/>
<mspace id="multi75presub" width="10px" height="5px" depth="5px" style="background: black"/>
</mmultiscripts>
<msub id="msub100">
<mspace id="msub100base" width="30px" height="100px" depth="100px" style="background: black"/>
<mspace id="msub100sub" width="10px" height="5px" depth="5px" style="background: black"/>
</msub>
<msup id="msup100">
<mspace id="msup100base" width="30px" height="100px" depth="100px" style="background: black"/>
<mspace id="msup100sup" width="10px" height="5px" depth="5px" style="background: black"/>
</msup>
<msubsup id="msubsup100">
<mspace id="msubsup100base" width="30px" height="100px" depth="100px" style="background: black"/>
<mspace id="msubsup100sub" width="10px" height="5px" depth="5px" style="background: black"/>
<mspace id="msubsup100sup" width="10px" height="5px" depth="5px" style="background: black"/>
</msubsup>
<mmultiscripts id="multi100">
<mspace id="multi100base" width="30px" height="100px" depth="100px" style="background: black"/>
<mspace id="multi100postsub" width="10px" height="5px" depth="5px" style="background: black"/>
<mspace id="multi100postsup" width="10px" height="5px" depth="5px" style="background: black"/>
<mprescripts/>
<mspace id="multi100presub" width="10px" height="5px" depth="5px" style="background: black"/>
<mspace id="multi100presup" width="10px" height="5px" depth="5px" style="background: black"/>
</mmultiscripts>
</math>
</p>
</body>
</html>
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