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Test Info:

<!DOCTYPE html>
<html>
<head>
<link rel="help" href="https://drafts.csswg.org/css-env-1/">
<title>Test that CSS env vars work with @support</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@supports (background-color: env(test)) {
body { background-color: rgb(0, 128, 0); }
}
</style>
</head>
<body>
<script>
test(() => {
const style = window.getComputedStyle(document.body);
assert_equals(style.getPropertyValue("background-color"), "rgb(0, 128, 0)");
});
</script>
</body>
</html>