Detecting whether there's overflow or not WITHOUT javascript

Solution for this StackOverflow question: http://stackoverflow.com/q/7141874/613540

HTML

<div class="wrapper"> 
  <div class="container"> 
    <button class="addmore">Add another row</button> 
    <p>Lorem ipsum dolor set amet.</p> 
  </div> 
  <div class="whitewash"></div> 
  <p class="more"><a href="#">more...</a></p> 
</div>

CSS

* {margin: 0;}
html, body {
    height: 100%;
    font-size: 2em;
    padding: 0;
    margin: 0;
}
p {
    padding: 5px;
}
.wrapper {
    height: 100%;
    position: relative;
    overflow: hidden;
}
.container {
    background-color: transparent;
}
.whitewash {
    position: relative;
    height: 2000px;
    background-color: white;
    z-index: 2;
}
.more {
    position: absolute;
    bottom: 0;
    height: 1em;
    width: 100%;
    background-color: white;
    z-index: 1;
}

JavaScript

/**
 * JavaScript is only used for demo purposes
 * To make the "Add another row" work.
 **/
$(document).ready(function() {
    $('.addmore').click(function(e){
        $('.container').append('<p>Lorem ipsum dolor set amet.</p>');
    });
});