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getElementOffset in JavaScript
// calcule the offset in pixels to top of the site,
// from a DOM element (el)
export default function getElementOffset(el) {
let top = 0
let left = 0
// grab the offset of the element relative to it's parent,
// then repeat with the parent relative to it's parent,
// ... until we reach an element without parents.
do {
top += el.offsetTop
left += el.offsetLeft
el = el.offsetParent
} while (el)
return { top, left }
}
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