.maxX

When bounds are applied, maxX refers to the maximum "legal" value of the horizontal property (either "x" or "left", depending on which type the Draggable is). This makes it easier to run your own custom logic inside the snap or callback function(s) if you so choose. So for a Draggable oftype:"x,y", maxX would correlate with x transform translation, as in the css transform:translateX(...). For type:"top,left", the Draggable'smaxX would correlate with the css "left" value that's applied. This is not the global coordinate - it is the inline css-related value applied to the element.
Implementation
    public function get maxX():Number