what cleanup is necessary if a widget creates multiple child elements

Hi, I'm wondering what, if anything I need to do from a cleanup
perspective when using a Widget that creates child elements. For
example:

public class MyWidget extends Widget {

public MyWidget() {
Element el = DOM.createDiv();
setElement(el);

Element anotherEl = DOM.createDiv();
el.appendchild(anotherEl);
}
}

With the code above, should I do anything with "anotherEl" on detatch?
Thanks for the advice.

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