title: CSS: variable font-size depending on text length
body: <p>Is it possible to make the font-size parameter depend on the length of the text?
  Of course I could realize this is possible with JavaScript, but I don't want to. ;)</p>
  
  <p>I have a box which has 140px width and height. The content should be 100px w+h (padding of the box: 20px). My text should use this 100px width best. Also on a text change on the page (AJAX) the text should assign to width=100px.</p>
  
  <p>Is that possible?</p>