Slide transitions can misjudge final dimensions - workaround should be documented

Sometimes slideDown, slideUp and slideToggle events can misjudge the final dimensions of the page, and hence slide the element too far or not far enough - leading to a "jump" into the correct position at the end of the slide transition.

This can be worked around by an explicit height or width specification on the element in question, and it would be helpful if that workaround was documented on these methods.

Some references:
http://www.bennadel.com/blog/2263-Use-jQuery-s-SlideDown-With-Fixed-Width-Elements-To-Prevent-Jumping.htm
(note that the width doesn't actually need to be fixed - any specified width will probably work; the explanation is helpful though)
http://forum.jquery.com/topic/slidedown-goes-to-far-then-jumps-back

Start with the API documentation for the slideDown, slideUp, and slideToggle methods. Review the linked references for the documented workaround, then update the relevant method pages to explain that specifying an explicit height or width can prevent the transition from jumping. Done means the workaround is clearly documented for these methods.