Shouldn't css3 transitions animate between height: 100% and height: 200px?

css3 transitions will interpolate the state of the height o开发者_C百科f a div.

Currently, chrome13 will not interpolate if you set the height with a different unit than the previous height

i.e.:

set height to 100%

set height to 50% (on a different rendering frame)

height will animate correctly (assuming proper use of transition)

set height to 100px

height will not animate

Chrome bug? spec bug?

Illustrative jsfiddle for the motivated: http://jsfiddle.net/zDywJ/21/

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I don't think this is a bug in Chrome or in the spec.

As far as I can see, CSS has no way to change a percentage into a pixel unit... so it would not have a way to compare the beginning and end in order to execute the transition.