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<!DOCTYPE html>
<title>Custom Functions: @function inside @media</title>
<link rel="help" href="https://drafts.csswg.org/css-mixins-1">
<link rel="help" href="https://drafts.csswg.org/css-conditional-3/#at-media">
<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>
@media (width >= 50px) {
@function --f() { result: 50; }
}
@media (width >= 100px) {
@function --f() { result: 100; }
}
#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(), '50', '--actual before resize');
iframe.style.width = '100px';
assert_equals(actualValue(), '100', '--actual after resize');
iframe.style.width = '';
assert_equals(actualValue(), '50', '--actual after resizing back to original');
});
</script>
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