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I can't but I'd downvote this simply for not being cross browser compatible in some form

An idea can be interesting without being cross-browser. The author makes no claims about this being the defacto-enterprise-grade blinking dot.

Might be nice if the link title mentioned it, so save the rest of us the time.

I think the idea of a pulsating dot has been around long enough that it could have been implemented a bit more solid.