How do you get the pageYOffset of from the bottom of the window and not the top ( Javascript )?
<p>I need to get the pageYOffset of the bottom of the viewable area, whether the user is zoomed in on the webpage or not, on Mobile Safari ( iPhone ).  However pageYOffset returns the offset from the <em>upper left corner of the window</em>.  </p>

<p>Spec:</p>

<p>"pageYOffset properties returns the pixels the current document has been scrolled from the <em>upper left corner of the window</em>"</p>

<p>How do you get the page y offset from the bottom of the viewable area, (zoomed in or not) on the iPhone via Javascript?</p>
