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The latest dev version of Google Chrome performs (most) of these CSS3 transitions too. The one transition I didn't see was the "video in a round frame". Maybe it's my system, but I thought the text rendering in the first transition example was sharper in Google Chrome than in FF b2.

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For the rounded video effect I'm pretty sure they're just applying the moz equivalent of border-radius or doing an alpha mask to a video tag. Chrome has supported both for a little while now in their stable releases.

In the video he says it's svg I think.

No, it's a clip-path.

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