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<!doctype html>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<body>
<div id="main" style="height: 200vh; width: 200vw;"></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);
window.scrollTo(0, 100);
assert_equals(window.scrollY, 100);
navigation.onnavigate = e => e.intercept(
{ scroll: "after-transition",
handler: async () => {
if (e.navigationType == "push") {
// Inserting this <div> should scroll *after* the scroll position
// is saved, so that it doesn't break scroll restoration when going
// back.
let div = document.createElement("div");
div.style = "height: 1000px; width: 1000px;";
document.body.insertBefore(div, main);
}
}
}
);
await navigation.navigate("?go").finished;
// Ensure the layout changes and scroll position update from the first
// navigation are processed before navigating back, otherwise the restored
// scroll postion can be overwritten.
await new Promise(resolve => requestAnimationFrame(resolve));
await navigation.back().finished;
assert_equals(window.scrollY, 100);
}, "scroll: state should be saved before intercept handlers run");
</script>
</body>
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