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<!DOCTYPE html>
<html>
<head>
<link rel="help" href="https://drafts.csswg.org/css-env-1/">
<title>Test that CSS env vars work with CSS.supports</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
test(() => {
assert_true(CSS.supports("background: env(test)"));
assert_true(CSS.supports("background", "env(test)"));
assert_true(CSS.supports("background", "env(test, 10px)"));
assert_true(CSS.supports("background", "foobar(env(test))"));
assert_false(CSS.supports("background", "env()"));
assert_true(CSS.supports("background", "env(test, )"));
assert_true(CSS.supports("background", "env(test,)"));
});
</script>
</body>
</html>
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