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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /css/css-viewport/zoom/font-relative-units.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<meta name="assert" content="test font-relative units and zoom">
<style>
html {
font-size: 20px;
line-height: 1;
zoom: 2;
}
.unit {
height: 20px;
outline: 1px solid black;
outline-offset: -1px;
}
.unit::after {
content: attr(id);
font-size: 10px;
}
</style>
</head>
<body>
<div id="div"></div>
<script>
const units = [
['em', 'rem'],
['lh', 'rlh'],
['ex', 'rex'],
['cap', 'rcap'],
['ch', 'rch'],
['ic', 'ric'],
];
for (const pair of units) {
for (const unit of pair) {
div.insertAdjacentHTML("beforeend", `<div class="unit" id="${unit}" style="width: 5${unit}"></div>`);
}
}
setup({ explicit_done: true });
document.fonts.ready.then(() => {
for (const [localUnit, rootUnit] of units) {
test(() => {
let localUnitWidth = document.getElementById(localUnit).getBoundingClientRect().width;
let rootUnitWidth = document.getElementById(rootUnit).getBoundingClientRect().width;
assert_equals(localUnitWidth, rootUnitWidth, `expect 1${localUnit} = 1${rootUnit} at the same effective zoom`);
}, `${localUnit} = ${rootUnit}`);
}
done();
});
</script>
</body>
</html>