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+<!DOCTYPE html>
+<meta charset=utf-8>
+<title>Test what happens when a top-level module is not found</title>
+<script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
+<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.js" onerror="eventCount++">
+</script>
+<body onload='testError()'></body>