code: function offset(element) {
    var screenPos = screenPosition(element);
  
    return screenPos && {
      top: screenPos.top + window.scrollY,
      left: screenPos.left + window.scrollX
    };
  }
docs: Returns the top and left offset of an element. Offset is relative to web page.
  @param {(string|Array|NodeList|HTMLCollection|Element)} element - The element. Note that it'll be passed to getElement to ensure there's only one.
  @return {(Object|boolean)} offset - Offset object or false if no element found.
  @return {Object.top} top - Top offset in pixels.
  @return {Object.left} left - Left offset in pixels.
  @example //esnext
  import { setStyleProp, append, offset }
  setStyleProp([document.documentElement, document.body], {
  position: 'relative',
  margin: 0,
  padding: 0
  })
  append(document.body, '.sushi')
  const sushi = setStyleProp('.sushi', {
  display: 'block',
  width: 100,
  height: 100,
  position: 'absolute',
  top: 200,
  left: 240,
  background: 'red'
  })
  offset(sushi) // returns: { top: 200, left: 240 }
  @example //es5
  Chirashi.setStyleProp([document.documentElement, document.body], {
  position: 'relative',
  margin: 0,
  padding: 0
  })
  Chirashi.append(document.body, '.sushi')
  var sushi = Chirashi.setStyleProp('.sushi', {
  display: 'block',
  width: 100,
  height: 100,
  position: 'absolute',
  top: 200,
  left: 240,
  background: 'red'
  })
  Chirashi.offset(sushi) // returns: { top: 200, left: 240 }