Custom messages in onbeforeunload dialogs (removed)
A window’s onbeforeunload property may be set to a function that returns a string. If the function returns a string, then before unloading the page, a dialog is shown to have the user confirm that they indeed want to navigate away. The string provided by the function will no longer be shown in the dialog. Rather, a generic string not under the control of the webpage will be shown.
Specification
Status in Chromium
Removed (launch bug) in:
- Chrome for desktop release 51
- Chrome for Android release 51
- Android WebView release 51
- Opera release 38
- Opera for Android release 38
Consensus & Standardization
Owner
Last updated on 2016-06-02
Comments
This shipped in Safari 9.1, and has been shipping in Firefox since Firefox 4. Safari considers this a security fix and assigned it CVE-2009-2197 (see https://support.apple.com/en-us/HT206171 ). Approved with the intent https://groups.google.com/a/chromium.org/d/msg/blink-dev/YIH8CoYVGSg/Di7TsljXDQAJ .