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function checkScroll() {
// Ensure two animation frames on load to test the fallback to element
// anchor, which gets queued for the next frame if the text fragment is not
// found.
requestAnimationFrame(() => {
requestAnimationFrame(() => {
let results = {
scrolled: (window.pageYOffset != 0),
};
let key = (new URL(document.location)).searchParams.get("key");
stashResultsThenClose(key, results);
});
});
}
window.addEventListener('pageshow', () => {
if (location.hash == "#history") {
// This is the "history" test - on the first load we'll navigate to a page
// that calls history.back(). When we load a second time (from the back
// navigation), record the scroll state at that point to check how history
// scroll restoration is handled.
if (history.state == null) {
history.pushState("test", "test", "");
requestAnimationFrame(() => {
location.href = "navigate-back.html";
});
return;
}
}
checkScroll();
});
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