title: Character Limit On Textbox
body: <pre><code>&lt;input id="post" type="text" style="width:400px;"/&gt;
  </code></pre>
  
  <p>You know when you go to a site, start typing in a textbox, and all of a sudden, your keyboard stops typing stuff because you've reached the character limit?</p>
  
  <p>How can I make that happen for this textbox for 140 chars?</p>