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<!doctype html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div style="height: 1000px; width: 1000px;"></div>
<div id="frag"></div>
<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));
assert_equals(window.scrollY, 0);
await navigation.navigate("#frag").finished;
assert_not_equals(window.scrollY, 0);
navigation.onnavigate = e => {
e.intercept({
scroll: "manual",
handler: t.step_func(() => {
e.scroll();
assert_equals(window.scrollY, 0);
assert_throws_dom("InvalidStateError", () => e.scroll());
})
});
};
await navigation.back().finished;
assert_equals(window.scrollY, 0);
}, "scroll: scroll() should throw if called a second time");
</script>
</body>
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