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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<iframe id="i" src="/common/blank.html"></iframe>
<body>
<script>
promise_test(async t => {
// Wait for after the load event so that the navigation doesn't get converted
// into a replace navigation.
await new Promise(resolve => window.onload = () => t.step_timeout(resolve, 0));
await i.contentWindow.navigation.navigate("#1").finished;
i.contentWindow.navigation.onnavigate = t.step_func(e => {
assert_false(e.cancelable);
// intercept() should throw with commit: "after-transition" because e.cancelable is false.
let iframe_constructor = i.contentWindow.DOMException;
assert_throws_dom("InvalidStateError", iframe_constructor, () => e.intercept({ commit: "after-transition" }));
});
await i.contentWindow.navigation.back().finished;
}, "{ commit: 'after-transition' } for an uncancelable traverse navigation");
</script>
</body>
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