replaceChild( )
Let’s suppose that instead of inserting our new div before the firstChild of the body element, we wanted it to replace the firstChild.
To do so, we could use the replaceChild( ) method:
body.replaceChild( new_div, body.firstChild );
Like insertBefore( ), replaceChild( ) takes two arguments: The first argument is the node you want inserted in the place of the node that is the second argument.
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