Save sidebar scroll position

https://twitter.com/hakimel/status/1262337514741706752

let sidebar = document.querySelector('.sidebar')
let top = sessionStorage.getItem('sidebar-scroll')
if (top !== null) {
  sidebar.scrollTop = parseInt(top, 10)
}
window.addEventListener('beforeunload', () => {
  sessionStorage.setItem('sidebar-scroll', sidebar.scrollTop)
})

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