score:-1

it is noted here

note: not all css properties are animatable. in general, any css property that accepts values that are numbers, lengths, percentages, or colors is animatable. some css properties that accept discrete values can be animated as well, but display a jump between values rather than a smooth transition when changed, such as the visibility property.

safari css reference

score:0

maybe this could help. on the safari css visual effects guide it's says that you have to use this:

-webkit-transition-property: opacity;

you can also change the duration of it doing:

-webkit-transition-duration: 2s;"

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