[jQuery] append() strange behaviour

[David]

I am trying to do:

$("#oneId > #anotherId").append(HTML);

but it doesn't work. On the other hand, next line works:

$("#oneId > #anotherId").remove();

What works for the first case is:

$("#oneId  div[id='anotherId']").each(function(){
        $(this).append(HTML);
});

I don't understand why "$("#oneId > #anotherId").append(HTML);"
doesn't work.

Thanks in advance.