<!DOCTYPE html>
<html>
<head>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>
    async_test(function(t) {
        if (window.internals) {
            internals.setConsoleMessageListener(function() {
                t.done();
            });
        } else {
            setTimeout(function() { t.done(); }, 500);
        }
        let invalidHost = "http://invalid.localhost";
        assert_true(navigator.sendBeacon(invalidHost, 'test'), "sendBeacon should return true");
    }, "Should log an error message in the console");
</script>
</body>
</html>