title: how to use bind-once or angular-once in element attributes
body: <p>Can I prevent angular watcher creation for element attributes using bind-once or angular-once directive?</p>
  
  <p>I am using <a href="https://github.com/tadeuszwojcik/angular-once" rel="nofollow">Angular Once</a> directive.</p>
  
  <p><code>How to use in following</code></p>
  
  <pre><code>&lt;div contentKey={{conKey}}&gt;&lt;/div&gt;
  </code></pre>
  
  <p><code>This working fine</code></p>
  
  <p><strong>Before Angular Once</strong></p>
  
  <pre><code>&lt;div&gt;{{conKey}}&lt;/div&gt;
  </code></pre>
  
  <p><strong>After Angular Once</strong></p>
  
  <pre><code>&lt;div&gt;&lt;any once-text="conKey"&gt;&lt;/any&gt;&lt;/div&gt;
  </code></pre>