Number - The current y (vertical) position of the Draggable instance. For a Draggable of
type: "x,y", it would be the
y transform translation, as in the CSS
transform: translateY(...). For
type: "top,left", the Draggable’s
y would refer to the CSS
top value that’s applied. This is not the global coordinate - it is the inline CSS-related value applied to the element.
This value is updated each time the Draggable is dragged interactively and during the momentum-based tween that Draggable applies when the user releases their mouse/touch, but if you manually change (or tween) the element’s position you can force Draggable to look at the “real” value and record it to its own
y property by calling the Draggable’s
update() method. Basically that re-synchronizes it. Again, this is not necessary unless other code (outside Draggable) alters the target element’s position.