Contains information about a new size and location for a visual element.

Event handlers for the Element.Placed event will be called with an instance of PlacedArgs, containing the following fields:

{
    x,      // X-coordinate of the element's new position
    y,      // Y-coordinate of the element's new position
    width,  // The new width of the element.
    height  // The new height of the element
}

All coordinates are in the parent node's local space, in points.