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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
async_test(t => {
navigation.onnavigate = t.step_func_done(e => {
assert_throws_js(TypeError, () => e.intercept({ handler: null }));
});
location.href = "#1";
assert_equals(location.hash, "#1");
}, "event.intercept() should throw if the handler is null");
async_test(t => {
navigation.onnavigatesuccess = t.step_func_done(e => {});
navigation.onnavigate = e => e.intercept({ handler: undefined });
location.href = "#2";
assert_equals(location.hash, "#2");
}, "event.intercept() should not throw if the handler is explicit undefined");
</script>
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