title: how to implement 'page break' in epub reader
body: <p>Any idea how to implement 'page break' in epub reader? 
  .epub is nothing but HTML pages, and epub reader renders those html pages.
  but i wonder how some epub readers like Adobe Digital Edition implemented page break.
  There,when we jump to any page, you will not find half displayed line(i.e only upper part of the letters visible and lower part will be in the next page) or half images where the other part in the next page.
  How to push the line to next page if i cannot display it completely in the current page?</p>