<https://w3schools.invisionzone.com/topic/53171-problem-with-blur/#comment-293006>
<http://schema.org/text>
"the example that i gave before ( http://www.w3schools.com/jsref/event_onunload.asp ) dosent work, its not show me the alert msg... "
<https://w3schools.invisionzone.com/topic/53171-problem-with-blur/?tab=comments#comment-293006>