Editable DIV Shown As Page View - Overflowing Text Should Be Flow To Another Div

I've a div that is editable (contentEditable = true). The div has a fixed size like a letter page. When the user has written so much text that the text overflows I want add a new div above and let flow the overflown text in the other div. (it's the some behavior like MS Word in page view, but now it is in the web)

It is possible to do something like this in the web?

One way to implement this is to check if the text of the div overflows (I've found java script examples in the web which do that). And than I need the text that overflows to move it to the next div. But I have not found a function that do this. Is there such a function?

Another way is to insert a gap at that position a new page begins and use an background image that looks like a page border. With this solution, the whole text is in one div but it looks like floating to another page. But therefore, I have to add a gap between to lines at a specific position (the page border/margin and the gab between the pages). Does anyone have an idea how to realize this?