The browser should offer some kind of permission system (like with the GPS sensor) that would ask the user if a website has permissions to access the vibrate API.
It's just like using location information. There are cases where it might be appropriate, such as web-based chat, or webmail. But there are many more cases where it would not be appropriate.
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[ 4.3 ms ] story [ 38.6 ms ] threadThat would make the Grooveshark HTML5 app 99% more useful than it currently is (not at all).