How to run JavaScript event when the iPad's screen is locked?

I am developing an alarm in HTML5 for iPad, but I noticed that when the screen goes into standby (or is b开发者_开发问答locked by the user), Safari blocks all events. I tried setTimeout().

How to solve?

I just need to refresh the page or run a .mp3 after a certain period of time.

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That's not possible. Safari goes to sleep when the device is in sleep mode.

Running Timer in iPhone Sleep mode (with no javascript)?

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You'd need a native app for this, AFAIK.