onfocusin event occurs when an element is about to get focus.
Note: Unlike onfocus event, the
onfocusin event will bubble, i.e., The element with
onfocusin event will be affected when its child element gets focus.
onfocusin Event as Attribute
Using Event Listener
Using addEventListener() Method
Note: The addEventListener() method is not supported in Internet Explorer 8 and below.
onfocus vs onfocusin
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