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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Subscripts and Superscripts metrics</title>
<link rel="help" href="https://mathml-refresh.github.io/mathml-core/#msubmsup">
<meta name="assert" content="Basic metrics for the mmultiscript element.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.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);
function runTests() {
test(function() {
var e = 1;
assert_less_than_equal(getBox("msubBase").right, getBox("msubSub").left, e, "subscript is after base");
assert_less_than_equal(getBox("msupBase").right, getBox("msupSup").left, e, "superscript is after base");
assert_less_than_equal(getBox("msubsupBase").right, getBox("msubsupSub").left, e, "subscript is after base");
assert_less_than_equal(getBox("msubsupBase").right, getBox("msubsupSup").left, e, "superscript is after base");
assert_greater_than_equal(getBox("premsubBase").right, getBox("premsubSub").left, e, "subscript is before base");
assert_greater_than_equal(getBox("premsupBase").right, getBox("premsupSup").left, e, "superscript is before base");
assert_greater_than_equal(getBox("premsubsupBase").right, getBox("premsubsupSub").left, e, "subscript is before base");
assert_greater_than_equal(getBox("premsubsupBase").right, getBox("premsubsupSup").left, e, "superscript is before base");
e = 3;
assert_approx_equals(getBox("msubBase").right, getBox("msubSub").left, e, "msub: space between base and subscript is small");
assert_approx_equals(getBox("msubBase").right, getBox("msubSub").left, e, "msub: subscript is after base");
assert_approx_equals(getBox("msupBase").right, getBox("msupSup").left, e, "msup: superscript is after base");
assert_approx_equals(getBox("msubsupBase").right, getBox("msubsupSub").left, e, "msubsup: subscript is after base");
assert_approx_equals(getBox("msubsupBase").right, getBox("msubsupSup").left, e, "msubsup: superscript is after base");
assert_approx_equals(getBox("premsubBase").left, getBox("premsubSub").right, e, "msub: space between base and subscript is small");
assert_approx_equals(getBox("premsubBase").left, getBox("premsubSub").right, e, "msub: subscript is after base");
assert_approx_equals(getBox("premsupBase").left, getBox("premsupSup").right, e, "msup: superscript is after base");
assert_approx_equals(getBox("premsubsupBase").left, getBox("premsubsupSub").right, e, "msubsup: subscript is after base");
assert_approx_equals(getBox("premsubsupBase").left, getBox("premsubsupSup").right, e, "msubsup: superscript is after base");
}, "Respective horizontal positions");
test(function() {
var e = 1;
assert_approx_equals(getBox("msubBase").middle, getBox("baseline").bottom, e, "base is placed on the baseline");
assert_approx_equals(getBox("msupBase").middle, getBox("baseline").bottom, e, "base is placed on the baseline");
assert_approx_equals(getBox("msubsupBase").middle, getBox("baseline").bottom, e, "base is placed on the baseline");
assert_approx_equals(getBox("premsubBase").middle, getBox("baseline").bottom, e, "base is placed on the baseline");
assert_approx_equals(getBox("premsupBase").middle, getBox("baseline").bottom, e, "base is placed on the baseline");
assert_approx_equals(getBox("premsubsupBase").middle, getBox("baseline").bottom, e, "base is placed on the baseline");
}, "Alignment of the base on the baseline");
test(function() {
var e = 3;
assert_approx_equals(getBox("msubSub").middle, getBox("msubBase").bottom, e, "script is placed at the bottom of the base");
assert_approx_equals(getBox("msupSup").middle, getBox("msupBase").top, e, "script is placed at the top of the base");
assert_approx_equals(getBox("msubsupSub").middle, getBox("msubsupBase").bottom, e, "script is placed at the bottom of the base");
assert_approx_equals(getBox("msubsupSup").middle, getBox("msubsupBase").top, e, "script is placed at the top of the base");
assert_approx_equals(getBox("premsubSub").middle, getBox("premsubBase").bottom, e, "script is placed at the bottom of the base");
assert_approx_equals(getBox("premsupSup").middle, getBox("premsupBase").top, e, "script is placed at the top of the base");
assert_approx_equals(getBox("premsubsupSub").middle, getBox("premsubsupBase").bottom, e, "script is placed at the bottom of the base");
assert_approx_equals(getBox("premsubsupSup").middle, getBox("premsubsupBase").top, e, "script is placed at the top of the base");
}, "Vertical position of scripts");
test(function() {
var e = 3;
assert_approx_equals(getBox("msub").width, getBox("msubSub").right - getBox("msubBase").left, e, "width is determined by the left/right sides of base/script (+ some space after script)");
assert_approx_equals(getBox("msup").width, getBox("msupSup").right - getBox("msupBase").left, e, "width is determined by the left/right sides of base/script (+ some space after script)");
assert_approx_equals(getBox("msubsup").width, Math.max(getBox("msubsupSub").right, getBox("msubsupSup").right) - getBox("msubsupBase").left, e, "width is determined by the left/right sides of base/scripts (+ some space after script)");
assert_approx_equals(getBox("premsub").width, getBox("premsubBase").right - getBox("premsubSub").left, e, "width is determined by the right/left sides of base/script (+ some space after script)");
assert_approx_equals(getBox("premsup").width, getBox("premsupBase").right - getBox("premsupSup").left, e, "width is determined by the right/left sides of base/script (+ some space after script)");
assert_approx_equals(getBox("premsubsup").width, getBox("premsubsupBase").right - Math.min(getBox("premsubsupSub").left, getBox("premsubsupSup").left), e, "width is determined by the right/left sides of base/scripts (+ some space after script)");
}, "Width of scripted elements");
test(function() {
var e = 1;
assert_greater_than_equal(getBox("msub").height, getBox("msubBase").height, e, "height is at least the one of the base");
assert_greater_than_equal(getBox("msup").height, getBox("msupBase").height, e, "height is at least the one of the base");
assert_greater_than_equal(getBox("msubsup").height, getBox("msubsupBase").height, e, "height is at least the one of the base");
assert_greater_than_equal(getBox("premsub").height, getBox("premsubBase").height, e, "height is at least the one of the base");
assert_greater_than_equal(getBox("premsup").height, getBox("premsupBase").height, e, "height is at least the one of the base");
assert_greater_than_equal(getBox("premsubsup").height, getBox("premsubsupBase").height, e, "height is at least the one of the base");
e = 3;
assert_approx_equals(getBox("msub").height, Math.max(getBox("msubSub").bottom, getBox("msubBase").bottom) - getBox("msubBase").top, e, "msub height is determined by the top/bottom sides of base/scripts");
assert_approx_equals(getBox("msup").height, getBox("msupBase").bottom - Math.min(getBox("msupSup").top, getBox("msupBase").top), e, "msup height is determined by the top/bottom sides of base/scripts");
assert_approx_equals(getBox("msubsup").height, Math.max(getBox("msubSub").bottom, getBox("msubBase").bottom) - Math.min(getBox("msupSup").top, getBox("msupBase").top), e, "msubsup height is determined by the top/bottom sides of base/scripts");
assert_approx_equals(getBox("premsub").height, Math.max(getBox("premsubSub").bottom, getBox("premsubBase").bottom) - getBox("premsubBase").top, e, "msub height is determined by the top/bottom sides of base/scripts");
assert_approx_equals(getBox("premsup").height, getBox("premsupBase").bottom - Math.min(getBox("premsupSup").top, getBox("premsupBase").top), e, "msup height is determined by the top/bottom sides of base/scripts");
assert_approx_equals(getBox("premsubsup").height, Math.max(getBox("premsubSub").bottom, getBox("premsubBase").bottom) - Math.min(getBox("premsupSup").top, getBox("premsupBase").top), e, "msubsup height is determined by the top/bottom sides of base/scripts");
}, "Height of scripted elements");
test(function() {
["none", "mprescripts"].forEach(function(name) {
var elements = document.getElementsByTagName(name);
for (var i = 0; i < elements.length; i++) {
var box = elements[i].getBoundingClientRect();
assert_equals(box.height * box.width, 0, "<" + name + "> " + i + " has zero is empty");
}
});
}, "Size of empty elements");
done();
}
</script>
</head>
<body>
<div id="log"></div>
<p>
<math>
<mspace id="baseline" width="30px" height="2px" depth="0px" style="background: blue"/>
<mmultiscripts id="msub" style="background: green">
<mspace id="msubBase" width="30px" height="15px" depth="15px" style="background: black"/>
<mspace id="msubSub" width="10px" height="5px" depth="5px" style="background: black"/>
<none/>
</mmultiscripts>
<mmultiscripts id="msup" style="background: green">
<mspace id="msupBase" width="30px" height="15px" depth="15px" style="background: black"/>
<none/>
<mspace id="msupSup" width="10px" height="5px" depth="5px" style="background: black"/>
</mmultiscripts>
<mmultiscripts id="msubsup" style="background: green">
<mspace id="msubsupBase" width="30px" height="15px" depth="15px" style="background: black"/>
<mspace id="msubsupSub" width="10px" height="5px" depth="5px" style="background: black"/>
<mspace id="msubsupSup" width="10px" height="5px" depth="5px" style="background: black"/>
</mmultiscripts>
<mmultiscripts id="premsub" style="background: green">
<mspace id="premsubBase" width="30px" height="15px" depth="15px" style="background: black"/>
<mprescripts/>
<mspace id="premsubSub" width="10px" height="5px" depth="5px" style="background: black"/>
<none/>
</mmultiscripts>
<mmultiscripts id="premsup" style="background: green">
<mspace id="premsupBase" width="30px" height="15px" depth="15px" style="background: black"/>
<mprescripts/>
<none/>
<mspace id="premsupSup" width="10px" height="5px" depth="5px" style="background: black"/>
</mmultiscripts>
<mmultiscripts id="premsubsup" style="background: green">
<mspace id="premsubsupBase" width="30px" height="15px" depth="15px" style="background: black"/>
<mprescripts/>
<mspace id="premsubsupSub" width="10px" height="5px" depth="5px" style="background: black"/>
<mspace id="premsubsupSup" width="10px" height="5px" depth="5px" style="background: black"/>
</mmultiscripts>
</math>
</p>
</body>
</html>
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