Memorise scroll position across page loads | CSS Tricks

A neat trick (now third hand) for storing the scroll position of a sidebar or other element in local storage, allowing you to keep it constant across pages without the user seeing it flash into place:

let sidebar = document.querySelector(".sidebar");

let top = localStorage.getItem("sidebar-scroll");
if (top !== null) {
  sidebar.scrollTop = parseInt(top, 10);
}

window.addEventListener("beforeunload", () => {
  localStorage.setItem("sidebar-scroll", sidebar.scrollTop);
});

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