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<!DOCTYPE html>
<html>
<head>
<link rel="help" href="https://drafts.csswg.org/css-env-1/">
<title>Test env() will work in custom properties</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#parent {
--var1: inherited;
}
#child {
--my-width: env(test, 100px);
width: var(--my-width);
--var1: env(nonexistent);
}
</style>
</head>
<body>
<div id="parent">
<div id="child"></div>
</div>
<script>
test(() => {
const style = window.getComputedStyle(child);
assert_equals(style.getPropertyValue("width"), "100px");
}, 'env() is substituted into a custom property');
test(() => {
const style = window.getComputedStyle(child);
assert_equals(style.getPropertyValue("--var1"), "");
}, 'Substitution of unrecognized env() causes guaranteed-invalid');
</script>
</body>
</html>
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