I'll give it about 2 weeks...
...before everyone terms it of because of overuse by adverts,
Web wonks at the W3C have issued a new Recommendation that gives browsers control of vibrators. Recommendations are the W3C's polite way of defining standards, so this week's notification that the Vibration API has attained this status means the world now has a standard way to make devices throb, buzz, jitter, oscillate or …
Sadly it's not. It's already made it in on some mobile browsers. I got extremely confused when my phone beeped and vibrated upon visiting a website, with no notification / anything in sight. Did some research into it (at the time it was only a beta feature, and i've only had it happen to my phone on adverts)
Frankly I think it's daft, and I hope they enable a way to disable it because it was annoying as helll.