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Test Info: Warnings

<!DOCTYPE html>
<meta charset=utf-8>
<title>Install Element: Feature detection</title>
<link rel="help" href="https://github.com/WICG/install-element">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
test(() => {
const el = document.createElement("install");
assert_true(el instanceof HTMLInstallElement,
"install element should be an instance of HTMLInstallElement");
}, "Test HTMLInstallElement existence and instanceof");
</script>