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<!DOCTYPE html>
<title>Custom Functions: @media responds to changes</title>
<link rel="help" href="https://drafts.csswg.org/css-mixins-1/#conditional-rules">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
iframe {
width: 50px;
height: 50px;
}
</style>
<iframe id="iframe" srcdoc="
<div id=target></div>
<style>
@function --f() {
result: A;
@media (width = 100px) {
result: B;
}
@media ((width >= 110px) and (width <= 140px)) {
result: C;
}
@media (width = 150px) {
result: D;
}
}
#target {
--actual: --f();
}
</style>
"></iframe>
<script>
function waitForLoad(w) {
return new Promise(resolve => w.addEventListener('load', resolve));
}
promise_test(async () => {
await waitForLoad(window);
const target = iframe.contentDocument.querySelector('#target');
let actualValue = () => getComputedStyle(target).getPropertyValue('--actual');
assert_equals(actualValue(), 'A', '--actual before resize');
// [<width of frame>, <expected function result>]
let data = [
['100px', 'B'],
['105px', 'A'],
['110px', 'C'],
['125px', 'C'],
['140px', 'C'],
['145px', 'A'],
['150px', 'D'],
['155px', 'A'],
];
for (let d of data) {
iframe.style.width = d[0];
let expected = d[1];
assert_equals(actualValue(), expected, `--actual after resize to ${d[0]}`);
}
});
</script>
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