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Comparing scroll position to element in scroll handler
import throttle from 'lodash.throttle'
function handleScroll () {
// get the updated scroll position
const yOffset = window.pageYOffset
// compare to the cached pixel value when we want to reveal the element
if (yOffset > this.scrollIntoViewThreshold) {
// now reveal the element!
// ensure we don't fire this handler too often
// for a good intro into throttling and debouncing, see:
const throttledScrollHandler = throttle(handleScroll, 100)
// now re-check on scroll
window.addEventListener('scroll', throttledScrollHandler)
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