title: [attr.disabled]="true" does not working in anchor tag
body: <p>Why <code>[attr.disabled]="true"</code> does not working in anchor tag?</p>
  
  <h2>component:</h2>
  
  <pre><code>this.isHold=true;
  </code></pre>
  
  <h2>html:</h2>
  
  <pre><code>&lt;a (click)="showDialogToHold()" href="Javascript:void(0);" class="a-l2-link 
  img-space" icon="fa-angle-right" [attr.disabled]="isHold"&gt;Hold&lt;/a&gt;
  </code></pre>
  
  <p>I also tried <code>[disabled]="isHold"</code>. But <code>[disabled]</code> does not support for anchor tag. it's throwing this error <code>Can't bind to 'disabled' since it isn't a known property of 'a'</code> related with <a href="https://stackoverflow.com/questions/41241135/cant-bind-to-disabled-since-it-isnt-a-known-property-of-li">Can&#39;t bind to &#39;disabled&#39; since it isn&#39;t a known property of &#39;li&#39;</a> </p>