How do you recreate this font resizing effect?

Navigate to apple.com and resize the text (in Chrome this is Ctrl-+). The text at the top of the screen expands with a cool sliding effe开发者_如何学运维ct to match the new text size. You can also see the effect on this site: http://www.thedesigncubicle.com/.

How can I recreate this effect on my site?

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AFAIK, it's just the way that elements using fonts via @font-face rescale those fonts in Chrome at least.