title: HTML5 required attribute seems not working
body: <p>I can't figure out why the new <em>required</em> attribute of HTML5 seems to not be working, and I know my simple code seems to be okay. What should I do to make this work?</p>
  
  <p>Here is my code in HTML:</p>
  
  <pre><code>&lt;input type = "text" class = "txtPost" placeholder = "Post a question?" required&gt;
  &lt;button class = "btnPost btnBlue"&gt;Post&lt;/button&gt;
  </code></pre>
  
  <p>Correct me if I'm wrong but, if ever I run the code in the browser and click the button without any value in the textbox it should have a tooltip showing that that field was required, shouldn't it? But nothing happens no matter how many times you click the button. Am I misunderstood on how to use the <em>required</em> attribute?</p>
  
  <p>I am running my code in google chrome <code>Version 28.0.1500.72</code>.</p>