BeforeUnloadEvent
Read More at MDN DocsView SpecSafe to Use
BeforeUnloadEvent is considered safe to use.
It’s supported by 94% of global browsers.
Browsers
ChromeOct 1, 2013v30.0.0
26%╱100%
100% of Chrome users are running a supported version.
SafariOct 22, 2013v7.0.05%╱100%
100% of Safari users are running a supported version.
EdgeJan 15, 2020v79.0.05%╱100%
There are no users of Edge running a supported version.
FirefoxNov 29, 2005v1.5.03%╱100%
100% of Firefox users are running a supported version.
Version Breakdown
Support
Adoption
Chrome
Oct 1, 2013 v30.0.0
26%╱100%
100% of Chrome users are running a supported version.
Oct 1, 2013 – Latest
v30.0.0+
26%╱100%
Full Support
Chrome Android
Oct 2, 2013 v30.0.0
36%╱100%
100% of Chrome Android users are running a supported version.
Oct 2, 2013 – Latest
v30.0.0+
36%╱100%
Full Support
Deno
Jul 21, 2022 v1.24.0
Deno supports this feature.
Jul 21, 2022 – Latest
v1.24.0+
Full Support
Edge
Jan 15, 2020 v79.0.0
5%╱100%
There are no users of Edge running a supported version.
Jan 15, 2020 – Latest
v79.0.0+
5%╱100%
Full Support
Firefox
Nov 29, 2005 v1.5.0
3%╱100%
100% of Firefox users are running a supported version.
Nov 29, 2005 – Latest
v1.5.0+
3%╱100%
Full Support
Firefox for Android
Mar 29, 2011 v4.0.0
Firefox for Android supports this feature.
Mar 29, 2011 – Latest
v4.0.0+
Full Support
Internet Explorer
Sep 30, 1997 v4.0.0
0%╱100%
100% of Internet Explorer users are running a supported version.
Sep 30, 1997 – Latest
v4.0.0+
0%╱100%
Full Support
Unknown v5.0.0
Quest Browser supports this feature.
Unknown
v5.0.0+
Full Support
Opera
Oct 8, 2013 v17.0.0
1%╱100%
100% of Opera users are running a supported version.
Oct 8, 2013 – Latest
v17.0.0+
1%╱100%
Full Support
Opera Android
Nov 20, 2013 v18.0.0
Opera Android supports this feature.
Nov 20, 2013 – Latest
v18.0.0+
Full Support
Safari
Oct 22, 2013 v7.0.0
5%╱100%
100% of Safari users are running a supported version.
Oct 22, 2013 – Latest
v7.0.0+
5%╱100%
Full Support
Safari on iOS
Sep 18, 2013 v7.0.0
17%╱100%
There are no users of Safari on iOS running a supported version.
Sep 18, 2013 – Latest
v7.0.0+
17%╱100%
Full Support
Samsung Internet
Apr 10, 2015 v3.0.0
2%╱97%
There are no users of Samsung Internet running a supported version.
Apr 10, 2015 – Latest
v3.0.0+
2%╱97%
Full Support
WebView Android
Sep 3, 2014 v37.0.0
WebView Android supports this feature.
Sep 3, 2014 – Latest
v37.0.0+
Full Support