Google now uses them in Gmail . I think this will prove to be popular and Chrome-only notifications will be triggered on other sites. Then it will be implemented in WebKit, so Safari also has it. Firefox will then implement the implementation, and I suspect that it will eventually get standardized.
If it is not difficult to maintain (and it does not look like ), then I would do it. You will delight users who have Chrome, without compromising the experience for other users.
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