This is a lower-level API. Lower-level APIs are not recommended for most projects, and may not be available on all plans. See our page on recommended deployment patterns for more information.
Initialization Option Questions API

customUnload

This function is called when the user attempts to close the browser window. You would use this to display a custom error notification or dialog in order to warn the user that they may lose their progress if they don't save.

Values

Type function

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