gistfile1.js

var div = document.getElementsByTagName("div");
 
for ( var i = 0; i < div.length; i++ ) {
    for ( var e = 0; e < elems.length; e++ ) {
        div[i].appendChild( elems[e].cloneNode(true) );
    }
}

gistfile2.js

var div = document.getElementsByTagName("div");
 
var fragment = document.createDocumentFragment();
for ( var e = 0; e < elems.length; e++ ) {
    fragment.appendChild( elems[e] );
}
 
for ( var i = 0; i < div.length; i++ ) {
    div[i].appendChild( fragment.cloneNode(true) );
}