title: Attribute href not allowed on element button at this point
body: <p>I have a problem with a button and the W3C validation;
  my code:</p>
  
  <pre><code>&lt;button class="carousel-control left m-btn icn-only" href="#carousel_fade_2" data-slide="prev"&gt;&lt;i class="icon-chevron-left"&gt;&lt;/i&gt;&lt;/button&gt;
  </code></pre>
  
  <p></p>
  
  <p>error w3c: Attribute href not allowed on element button at this point.</p>
  
  <p>Any solution? </p>
  
  <p>Thank you for your help.</p>