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It doesn't work for me on the article page itself, but it you view the demo (link at the bottom of the article) then you can see it working.

I think he's referring to the effect in the UI itself. I don't see it either, so it's probably limited to some platforms.

Ah fair point, I don't use Chromium so hadn't noticed whether or not the effect was present.

The page itself confused me though as I thought the inline images were meant to be working demos and they did nothing for me until I went to the demo page itself.

[edit] fixed typo

Why are the demos on these things always on another page behind another link?

This effect is in Chrome for Mac OS only (I assume Chromium as well - haven't used that on the Mac yet). I noticed it a while back in that version... it's subtle. You have to be looking at the tab to notice.

The effect doesn't appear in either Chrome or Chromium for Linux or Windows.

I couldn't see it til I realised that it's only on inactive tabs.

Me neither, on Chrome and Windows 7.