docs(tutorial): updates for the text for animations in step 12
The grammar for the animation description has now been improved. Closes #12740
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Matias Niemelä
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@@ -239,9 +239,9 @@ The name of the starting class is the name of the event that is fired (like `ent
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The active class name is the same as the starting class's but with an `-active` suffix.
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This two-class CSS naming convention allows the developer to craft an animation, beginning to end.
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In our example above, elements expand from a height of **0** to **120 pixels** when items are added or moved,
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around and collapsing the items before removing them from the list.
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There's also a nice fade-in and fade-out effect that also occurs at the same time. All of this is handled
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In our example above, elements are expanded from a height of **0** to **120 pixels** when they're added to the
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list and are collapsed back down to **0 pixels** before being removed from the list.
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There's also a nice fade-in and fade-out effect that occurs at the same time. All of this is handled
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by the CSS transition declarations at the top of the example code above.
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Although most modern browsers have good support for [CSS transitions](http://caniuse.com/#feat=css-transitions)
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