My former eWEEK colleague Jason Brooks got the same error message, using a more recent Chrome beta build than me. "Ditto for Firefox," he tweeted.
It turns out the error message is a marketing stunt. Apple must be detecting the browser and blocking the demo to encourage people to download Safari -- and also to insinuate that other browsers are inferior. I say this because from the direct Safari Technology Demos page, the demos work just fine in Chrome.
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