Your code is incorrect: it invokes removeDeviceFromStorage immediately instead of specifying a function reference. Remove () like this: .....on('beforeunload', removeDeviceFromStorage);

victorhugo.lunar@ - Thanks for filing the issue...!!

Could you please provide a sample test file/url to test the issue from TE-end.
This will help us in triaging the issue further.

Thanks...!!

I remove the () but it is still not working...

$(window).off('beforeunload').on('beforeunload', removeDeviceFromStorage);

function removeDeviceFromStorage () {
    console.log('>>>removeDeviceFromStorage was called!!!');
    localStorage.removeItem("DEVICE_CREATED"); 
}

Thank you for providing more feedback. Adding the requester to the cc list.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Tried testing the issue on Win-10 using chrome reported version #67.0.3396.62 and latest canary #69.0.3450.0.

Attached a screen shot for reference.

Following are the steps followed to reproduce the issue.
------------
1. Opened the following code in console:
$(window).off('beforeunload').on('beforeunload', removeDeviceFromStorage);

function removeDeviceFromStorage () {
    console.log('>>>removeDeviceFromStorage was called!!!');
    localStorage.removeItem("DEVICE_CREATED"); 
}
2. Got an uncaught exception as follows:
VM60:1 Uncaught TypeError: Cannot read property 'off' of undefined
    at <anonymous>:1:10

victorhugo.lunar@ - Could you please provide a sample test file/url to test the issue from TE-end. This will help us in triaging the issue further.

Thanks...!!

Deleted: 849507.PNG 101 KB

	849507.PNG 101 KB View Download

We've landed a fix for beforeunload in cross-site iframes in  issue 853021 .  It should be working again in 69.0.3492.0, and we plan to merge the fix to Chrome 68.