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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>DisplayOperatorMinHeight with custom font</title>
<link
rel="help"
href="https://w3c.github.io/mathml-core/#layout-of-operators"
>
<meta
name="assert"
content="Laying out operators should respect the font's DisplayOperatorMinHeight"
>
<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>
/* This font has a DisplayOperatorMinHeight of 1.25em and two variants of the 0x2AFF
character, one with a height of 1.25em and the other with 2em. */
@font-face {
font-family: largeop-displayoperatorminheight1250;
src: url("/fonts/math/largeop-displayoperatorminheight1250.woff");
}
math {
font-family: largeop-displayoperatorminheight1250;
font-size: 32px;
color: green;
}
math > mo:first-child {
color: blue;
}
</style>
<script>
const font_size = 32;
const small_variant = 1.25 * font_size;
// Needs to be less than the difference between the two variants (2em - 1.25em)
const epsilon = 0.1 * font_size;
// Some browser engines had a minimum for DisplayOperatorMinHeight of sqrt(2) times
// the base glyph size (~1.41 * 1em in this case).
// This test checks that the constant is not modified and the variant measuring 1.25em
// is picked instead of the bigger one measuring 2em.
var t = async_test("DisplayOperatorMinHeight is not modified");
window.addEventListener("load", () => {
loadAllFonts().then(
t.step_func_done(function () {
const math = document.querySelector("math");
children = math.children;
largeop = children[1].getBoundingClientRect();
assert_approx_equals(
largeop.height,
small_variant,
epsilon,
"Using the small variant",
);
}),
);
});
</script>
</head>
<body>
<div id="log"></div>
<math display="block">
<mo largeop="false">⫿</mo>
<mo largeop="true">⫿</mo>
</math>
</body>
</html>
|
