How to use JQuery "after" selector

Go the other way around and use insertAfter().

$("<div id='xxx'></div>")
    .append($("#someotherdiv").clone())
    .insertAfter("#somediv > ul")

Try to add your generated DOM nodes to the document only after finishing your work.

Once the nodes are added to the displayed document, the browser starts listening to any change to refresh the view. Doing all the work before adding the nodes to the displayed document does improve browser performance.

use insertAfter():

$("<div id='xxx'></div>").insertAfter("#somediv > ul").append($("#someotherdiv").clone())