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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Stretching operators along the block axis</title>
<link rel="stylesheet" type="text/css" href="/fonts/ahem.css" />
<link rel="help" href="https://w3c.github.io/mathml-core/#dfn-algorithm-for-stretching-operators-along-the-block-axis">
<meta name="assert" content="">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/mathml/support/fonts.js"></script>
<style>
math {
font: 25px/1 Ahem;
}
@font-face {
font-family: stretchy;
src: url("/fonts/math/stretchy.woff");
}
mo {
font-family: stretchy;
}
</style>
<script>
setup({ explicit_done: true });
window.addEventListener("load", () => { loadAllFonts().then(runTests); });
function runTests() {
var epsilon = 2;
var emToPx = 25;
var element;
test(function() {
element = document.getElementById("horizontal_arrow");
assert_approx_equals(element.getBoundingClientRect().height, 1 * emToPx, epsilon, "horizontal characters don't stretch vertically");
element = document.getElementById("vertical_arrow");
assert_approx_equals(element.getBoundingClientRect().height, 6 * emToPx, epsilon, "vertical characters stretch vertically");
}, `Taking into account stretch axis.`);
test(function() {
element = document.getElementById("non_stretchy_horizontal_arrow");
assert_approx_equals(element.getBoundingClientRect().height, 1 * emToPx, epsilon, "horizontal characters don't stretch vertically");
element = document.getElementById("non_stretchy_vertical_arrow");
assert_approx_equals(element.getBoundingClientRect().height, 1 * emToPx, epsilon, "vertical characters stretch vertically");
}, `Taking into account stretchy property.`);
test(function() {
// There are only stretchy operators : the maximum of their base sizes
// is used as the target size.
let tallest_base_size = 2 * emToPx;
element = document.getElementById("small_vertical");
assert_approx_equals(element.getBoundingClientRect().width, .5 * emToPx, epsilon, "small width");
assert_approx_equals(element.getBoundingClientRect().height, tallest_base_size, epsilon, "height is the max(.5em, 1em, 2em)");
element = document.getElementById("medium_vertical");
assert_approx_equals(element.getBoundingClientRect().width, 1 * emToPx, epsilon, "normal width");
assert_approx_equals(element.getBoundingClientRect().height, tallest_base_size, epsilon, "height is the max(.5em, 1em, 2em)");
element = document.getElementById("big_vertical");
assert_approx_equals(element.getBoundingClientRect().width, 2 * emToPx, epsilon, "large width");
assert_approx_equals(element.getBoundingClientRect().height, tallest_base_size, epsilon, "height is the max(.5em, 1em, 2em)");
}, `Only operators with a stretchy property and block stretch axis.`);
test(function() {
// There are non-stretchy operators : the maximum of their base sizes
// is used as the target size. In any case, operators remain at least
// as large as their base size.
element = document.getElementById("smaller_op");
assert_approx_equals(element.getBoundingClientRect().width, .5 * emToPx, epsilon, "small width");
assert_approx_equals(element.getBoundingClientRect().height, 1.5 * emToPx, epsilon, "height is the max(.5em, 1em)");
element = document.getElementById("bigger_op");
assert_approx_equals(element.getBoundingClientRect().width, 2 * emToPx, epsilon, "large width");
assert_approx_equals(element.getBoundingClientRect().height, 2 * emToPx, epsilon, "height is the max(1em, 2em)");
}, `Operators smaller and larger than non-stretchy siblings.`);
test(function() {
element = document.getElementById("core_operator_1");
assert_approx_equals(element.getBoundingClientRect().height, 6 * emToPx, epsilon, "mrow");
element = document.getElementById("core_operator_2");
assert_approx_equals(element.getBoundingClientRect().height, 6 * emToPx, epsilon, "munder");
element = document.getElementById("core_operator_3");
assert_approx_equals(element.getBoundingClientRect().height, 6 * emToPx, epsilon, "mover");
element = document.getElementById("core_operator_4");
assert_approx_equals(element.getBoundingClientRect().height, 6 * emToPx, epsilon, "mundeover");
element = document.getElementById("core_operator_5");
assert_approx_equals(element.getBoundingClientRect().height, 6 * emToPx, epsilon, "complex nesting");
}, `Embellished operators`);
done();
}
</script>
</head>
<body>
<div id="log"></div>
<p>
<math>
<mrow>
<mspace width="1em" height="3em" depth="3em" style="background: blue"/>
<mo id="horizontal_arrow" stretchy="true">⥚</mo>
<mo id="vertical_arrow" stretchy="true">⥜</mo>
<mo id="non_stretchy_horizontal_arrow" stretchy="false">⥚</mo>
<mo id="non_stretchy_vertical_arrow" stretchy="false">⥜</mo>
</mrow>
</math>
</p>
<p>
<math>
<mrow>
<!-- This contains only vertical stretchy operators. -->
<mo style="font-size: 50%" id="small_vertical" stretchy="true">⥜</mo>
<mo style="font-size: 200%" id="big_vertical" stretchy="true">⥜</mo>
<mo style="font-size: 100%" id="medium_vertical" stretchy="true">⥜</mo>
</mrow>
</math>
</p>
<p>
<math>
<mrow>
<mspace style="background: blue" width="1em" height=".75em"/>
<mo style="font-size: 50%" id="smaller_op" stretchy="true">⥜</mo>
<mspace style="background: blue" width="1em" height="1.5em"/>
<mo style="font-size: 200%" id="bigger_op" stretchy="true">⥜</mo>
<mspace style="background: blue" width="1em" height="1em"/>
</mrow>
</math>
</p>
<p>
<math>
<mrow>
<mspace width="1em" height="3em" depth="3em" style="background: blue"/>
<mrow><mo id="core_operator_1" stretchy="true">⥜</mo></mrow>
<munder>
<mo id="core_operator_2" stretchy="true">⥜</mo>
<mspace></mspace>
</munder>
<mover>
<mo id="core_operator_3" stretchy="true">⥜</mo>
<mspace></mspace>
</mover>
<munderover>
<mo id="core_operator_4" stretchy="true">⥜</mo>
<mspace></mspace>
</munderover>
<mrow>
<mspace></mspace>
<munderover>
<mover>
<munder>
<mrow>
<mo id="core_operator_5" stretchy="true">⥜</mo>
</mrow>
<mspace></mspace>
</munder>
<mspace></mspace>
</mover>
<mspace></mspace>
<mspace></mspace>
</munderover>
</mrow>
</mrow>
</math>
</p>
</body>
</html>
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