code: function getStyle(el, styleProp) {
    if (typeof window === 'undefined') {
      return;
    }
  
    var style;
    if (el.currentStyle) {
      style = el.currentStyle[styleProp];
    } else if (window.getComputedStyle) {
      style = document.defaultView.getComputedStyle(el, null).getPropertyValue(styleProp);
    }
    if (style && style.length === 0) {
      style = null;
    }
    return style;
  }
docs: Gets a CSS style property.
  
  @param {Object} el A DOM element
  @param {String} styleProp The name of a style property
  @returns {Object} The style value