User prompts for "beforeunload" event should not automatically be dismissed

[kovalev007]

In my opinion Section 18 contains not correct logic.

• User prompts that are spawned from beforeunload event handlers, are dismissed implicitly upon navigation or close window, regardless of the defined user prompt handler.

Example:
If we have onbeforeunload event and user try close window:
In chrome 68.0.3440.106 user should interact with promt before window will closed.
In firefox 61 user should interact with promt before window will closed.
In firefox 62beta user should interact with promt before window will closed.
In firefox 63nightly user should interact with promt before window will closed.

But in automated test with geckodriver we have different behavior.
geckodriver 0.21.0 silently set dom.disable_beforeunload to true. (in firefox 61, 62, 63)
and when test close window promt not showing and window closed.

It is different behaviour.

[kovalev007]

Additional info:
mozilla/geckodriver#617 (comment)
mozilla/geckodriver#617 (comment)
mozilla/geckodriver#617 (comment)

[JamesZoft]

Hi - this burned us today whilst trying to write scripts to validate the appearance of a prompt on window close - is there some way we can get this addressed, please? This issue has been open quite a long time now. :)

[zeit200]

mozilla/geckodriver#1563
Hi, wanted to add that this behaviour blocks verifying of custom obeforeunload logic in automated tests

[Snipx]

Dear team, are there are news on this one? I agree that the specification currently blocks the use case of testing the user prompts on page reload/exit, and some of the implementing parties claim that they need to be compliant with the spec so I think the first move should be done by the spec community