code: function isIntrinsicSize(element, prop) {
  
  	var computedStyle = getComputedStyle(element);
  
  	if (computedStyle.display === 'none') {
  		return false;
  	}
  
  	if (computedStyle.display === 'inline') {
  		return true;
  	}
  
  	// Non-floating non-absolute block elements (only width)
  	if (
  		prop === 'width'
  		&& ['block', 'list-item', 'flex', 'grid'].indexOf(computedStyle.display) !== -1
  		&& computedStyle.cssFloat === 'none'
  		&& computedStyle.position !== 'absolute'
  		&& computedStyle.position !== 'fixed'
  	) {
  		return false;
  	}
  
  	var originalStyle = getOriginalStyle(element, prop);
  
  	// Fixed size
  	if (originalStyle && originalStyle.match(LENGTH_REGEXP)) {
  		return false;
  	}
  
  	// Percentage size
  	if (originalStyle && originalStyle.substr(-1) === '%') {
  		return false;
  	}
  
  	// Calc expression
  	if (originalStyle && originalStyle.substr(0, 5) === 'calc(') {
  		return false;
  	}
  
  	// Elements without a defined size
  	return true;
  
  }
docs: Is the size of the element depending on its descendants?
  
  @param  {Element} element
  @param  {string}  prop    `width` or `height`
  @return {boolean}