v1.4.2

Element animation is applied immediately by making element visible

http://jsfiddle.net/B6GdT/

v1.4.3 & v1.4.4

Element animation gets queued & is applied when element is visible

http://jsfiddle.net/6Mzv9/1/

Sangram, your second fiddle makes it appear that the animation happens once the element is shown, but that is not the case. The animation is happening while the element is hidden, and if you show it before the animation ends, then you'll see the end of the animation. This can be seen in the following fiddle http://jsfiddle.net/boushley/6Mzv9/2/ Just wrapped the show call inside of a click. If you wait until the animation should be done and then click the link... the animation has completed.

boushley, agreed to what you said, but my concern was this was breaking change in terms of UI appearance for which i didn't found any documentation.

i.e. change log for v.1.4.3

I had to update all my animation script to have property display:block

To be more clear check this i have just changed jquery libraries

v1.4.2 : http://jsfiddle.net/sangram/B8vPk/3/

v1.4.3 : http://jsfiddle.net/sangram/B8vPk/1/

v1.4.4 : http://jsfiddle.net/sangram/B8vPk/2/

I think the current behavior is correct, .animate() should only be called on visible elements if you want the animation to show. I'll mark this as needsdocs.

The docs for this have now been updated: http://api.jquery.com/animate/. Temporarily leaving the needsdocs tag in place in case we need to expand on the comments I've added.