Is memory cleanup on a div automatic for the children?

I have an html div that has about 6 divs under it. When I remove a Child on that div will the other divs be unallocated or must I first remove them? the divs are dynamically created. var window = document.createElement( 'div' ); then I add more elements to it. Later on at some point I want to remove these divs and I do so with removeElement on the top level div. Is that going to cause memory issue in the browser? If so would I be correct in thinking I must remove each child first.
Why don't you just try ?

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