Apparently Webkit and Opera auto-reverse transitions in T time, not T-TE time. Gecko uses T-TE. (http://is.gd/3ajx8M, step 2.)
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Replying to @meyerweb
@meyerweb Gecko behavior is slightly different from and better than current (unsettled) draft: http://is.gd/21d5dA http://is.gd/B0TEdZ

Mar 26, 2011 · 10:36 PM UTC