<!DOCTYPE html>
<div id="container"></div>
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script>
var test = async_test("This test checks if accessing navigator.serviceWorker doesn't crash with invalid frame");

if (window.testRunner)
    testRunner.setCanOpenWindows();

function callback() {
    // At this time window.navigator may be replaced with a new iframe's one,
    // which could be now invalid.
    var sw = navigator.serviceWorker;
    test.done();
}

test.step(function() {
    var w = window.open("x", "y");
    window.navigator = w.navigator;
    setTimeout(callback, 1);
});
</script>