javascript onbeforeunload not showing custom message

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To avoid scamming, chromium and hence chrome have decided to remove the ability to set a custom message in the onbeforeunload dialog.

See this bug report from the 18th of February, 2016.

onbeforeunload dialogs are used for two things on the Modern Web:
1. Preventing users from inadvertently losing data.
2. Scamming users.

In an attempt to restrict their use for the latter while not stopping the former, we are going to not display the string provided by the webpage. Instead, we are going to use a generic string.

Firefox already does this[…]

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