Animate glitch with margin overflow

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​http://codepen.io/anon/pen/snlhv

[timmywil]

I think this is the correct behavior. It is not opinionated about the value of the section's overflow.

Applying overflow: hidden facilitates the desired animation.

​http://codepen.io/timmywil/pen/yjKfd

[anonymous]

How can it be the correct behaviour if jQuery doesn't animate over the displayed height? If jQuery uses a theoretical height instead and the animation jumps/isn't fluid/has glitches, isn't the animation broken?

Margin collapse is a CSS feature. If jQuery decides not to support it maybe that should be in the documentation..