Save sidebar scroll position

https://twitter.com/hakimel/status/1262337514741706752May 19, 2020

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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