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Disallow window.open() during unload #3960
Chrome would like to limit the usage of
However, one difference between the proposed algorithm and the modal dialog functions is that the early return is mandatory unlike the returns in those functions. We have a strong preference to do that, as it allows testing through WPTs for browser interoperability.
Documentation need recorded at MDN content roadmap — https://trello.com/c/aBs1o6Pg/86-dom-general-enhancements-fx-64