Attribute for `<BODY ...>`
`onUnload ="script command(s)"`

onUnload runs a script when the reader leaves the page. For example, this code brings up an alert box when the user leaves the page:

this code produces this

<BODY onUnload="alert('bye now!')">
this page

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this code	produces this
<BODY onUnload="alert('bye now!')">	this page

Attribute for <BODY ...> onUnload ="script command(s)"