window.onload = (event) => { if ((document.documentElement.scrollHeight / window.screen.availHeight ) > 1.5) { window.addEventListener("scroll", () => { var winScroll = document.body.scrollTop || document.documentElement.scrollTop; var height = document.documentElement.scrollHeight - document.documentElement.clientHeight; var scrolled = (winScroll / height) * 100; document.getElementById('progress').style.width = scrolled + "%"; const toTop = document.getElementById('totop'); if ((window.scrollY > 0 && !toTop.classList.contains("show")) || (window.scrollY <= 0 && toTop.classList.contains("show"))) { toTop.classList.toggle("show"); } }); } }