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Test Info:

<!DOCTYPE html>
<meta charset=utf-8>
<title>Test what happens when a top-level module is not found</title>
<script>
var wasRun = false;
var errorCount = 0;
var eventCount = 0;
SimpleTest.waitForExplicitFinish();
window.onerror = function(message, url, line, column, error) {
errorCount++;
}
function testError() {
ok(eventCount == 1, 'Check that an error event was fired');
ok(errorCount == 0, 'Check that no error was reported');
SimpleTest.finish();
}
</script>
<script type="module" src="./nonExistentModule.mjs" onerror="eventCount++">
</script>
<body onload='testError()'></body>