Javascript Manual Selection doesn't replace

I have some text in a textbox. I automatically select some of it by calling textbox.setSelectionRange(a, b). But then, when I start typing again, the letters are appended on the right of the selection instead of replacing the selected text. Is there any way I can make the selection 'replaceable' by the user?
edit: it seems that if you execute the function twice on the same piece of text, the text doesn't replace any more. So that's what happened

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