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Test Info:

<html>
<head>
<title>Check async script state matches attribute</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<svg>
<script id="script" async href="data:text/javascript, // Do nothing."></script>
<script>
test(function() {
let script = document.getElementById("script");
script.remove();
assert_true(script.async, "script is async");
script.removeAttribute("async");
assert_false(script.async, "script is no longer async");
}, "async script state");
</script>
</svg>
</body>
</html>