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Change beforeunload handler dialog condition

Category

DOM

Type

No developer-visible change

Status

Enabled by default (Chrome 117)

Intent stage

Dev trials

Summary

To comply with HTML standard, there are two new changes on how the cancel dialog gets prompted for beforeunload event. 1. If event.preventDefault() is called, prompt cancel dialog. 2. If event.returnValue is the empty string, do not prompt cancel dialog.

Standards & signals

• Specification: https://html.spec.whatwg.org/multipage/browsing-the-web.html#checking-if-unloading-is-user-canceled
• Firefox: Shipped/Shipping
• Safari: Shipped/Shipping
• Web developers: Positive — https://bugs.chromium.org/p/chromium/issues/detail?id=866818 https://stackoverflow.com/questions/9626059/window-onbeforeunload-in-chrome-what-is-the-most-recent-fix https://stackoverflow.com/questions/1119289/how-to-show-the-are-you-sure-you-want-to-navigate-away-from-this-page-when-ch

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