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at-property-viewport-units-dynamic.html
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<!DOCTYPE html>
<title>@property: viewport units in initial value (dynamic)</title>
<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1/#initial-value-descriptor" />
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
iframe {
width: 400px;
height: 200px;
}
</style>
<iframe id=iframe srcdoc="
<style>
@property --10vw { syntax: '<length>'; inherits: true; initial-value: 10vw}
@property --10vh { syntax: '<length>'; inherits: true; initial-value: 10vh}
div {
background: green;
width: var(--10vw);
height: var(--10vh);
}
</style>
<div style='width:10vw'></div>
"></iframe>
<script>
iframe.offsetTop;
function waitForLoad(w) {
return new Promise(resolve => w.addEventListener('load', resolve));
}
promise_test(async (t) => {
await waitForLoad(window);
let element = iframe.contentDocument.querySelector('div');
assert_equals(getComputedStyle(element).getPropertyValue('--10vw'), '40px');
assert_equals(getComputedStyle(element).getPropertyValue('--10vh'), '20px');
iframe.style.width = '100px';
assert_equals(getComputedStyle(element).getPropertyValue('--10vw'), '10px');
assert_equals(getComputedStyle(element).getPropertyValue('--10vh'), '20px');
});
</script>