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| // Button/Link: #backToTopBtn | |
| document.getElementById('backToTopBtn').addEventListener('click', () => { | |
| var start = window.pageYOffset, startTime = null | |
| let step = (timestamp) => { | |
| if (!startTime) startTime = timestamp | |
| var progress = timestamp - startTime, | |
| percentage = Math.min(progress / 1000, 1) | |
| window.scrollTo(0, start * (1 - percentage)) | |
| if (progress < 1000) window.requestAnimationFrame(step) | |
| } | |
| window.requestAnimationFrame(step) | |
| }) |
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