# FAQ: Animation - Transitions - Timing Function

This community-built FAQ covers the “Timing Function” exercise from the lesson “Animation - Transitions”.

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## FAQs on the exercise Timing Function

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For the `transition-timing-function` property, what’s the “subtle difference” between the values `ease-in-out` and `ease`?

4 Likes

I was wondering that too.

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If we graph the transition with speed on the y-axis and time on the x-axis we have a choice of curves. Quick at first then slower; slower at first, then faster; slow-fast-slow; fast-slow-fast; and so on. The timing function is that curve.

If we compared this to a dissolve, that is, a transition between two slides, the curve might resemble a normal curve. The first slide would be fading more slowly at first then be overtaken by the new slide at the half way mark (the normal) and would be fading quickly after that while the new slide resolves into full view. Not a very good example, but a hint of one, at any rate.

That graph, by the way, looks very much like acceleration since it has time in both dimensions giving seconds squared.

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I got the dissolve example, but I didn’t get the difference of one ‘dissolve’/ease and the other/ease-in-out I tried (not too intently, I’ll admit) to find an image, but couldn’t. have any of you found it yet?

I did like the visual aid from this resource, though it ain’t about the ‘subtle difference’: Animation Principles in UI Design: Understanding Easing | by Suresh V. Selvaraj | Motion In Interaction | Medium

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Why does the gazelle grow to max-height? I thought max-height is just to indicate the largest an element can be, and doesn’t actually do anything until the browser is resized?