code: function screenPosition(element) {
    var rect = clientRect(element);
  
    return rect && {
      top: rect.top,
      left: rect.left
    };
  }
docs: Return the screen relative position of an element.
  @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)} screenPosition - Element's screen position or false if no element found.
  @return {Object.top} top - Y-coordinate, relative to the viewport origin, of the top of the rectangle box.
  @return {Object.left} left - X-coordinate, relative to the viewport origin, of the left of the rectangle box.
  @example esnext
  import { setStyleProp, append, screenPosition } from 'chirashi'
  
  setStyleProp([document.documentElement, document.body], {
  position: 'relative',
  margin: 0,
  padding: 0
  })
  
  append(document.body, '.poulp')
  
  const poulp = setStyleProp('.poulp', {
  display: 'block',
  position: 'absolute',
  top: 200,
  left: 240,
  width: 100,
  height: 100,
  background: 'red'
  })
  
  screenPosition(poulp) // returns: { top: 200, left: 240 }
  @example es5
  Chirashi.setStyleProp([document.documentElement, document.body], {
  position: 'relative',
  margin: 0,
  padding: 0
  })
  
  Chirashi.append(document.body, '.poulp')
  
  var poulp = Chirashi.setStyleProp('.poulp', {
  display: 'block',
  position: 'absolute',
  top: 200,
  left: 240,
  width: 100,
  height: 100,
  background: 'red'
  })
  
  Chirashi.screenPosition(poulp) // returns: { top: 200, left: 240 }