onbeforeunload

Fires immediately before a document is unloaded.

Browser/User Agent Support

IE	Netscape	Mozilla	Opera	Safari
4.0+	no	no	no	no

body
frameset

Component Developer Reference Documentation

CSS Reference
HTML Tag Reference
HTML DOM 0 Reference
HTML DOM 1 & 2 Reference
JavaScript Keywords Reference
JavaScript Core Reference

Note: This reference material is targeted to IT Mill Toolkit component developers.

So, if you are using IT Mill Toolkit and aren't developing any new components you don't have worry about the browser differences and you can safely ignore these reference documents.

onbeforeunload

Browser/User Agent Support

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