 found in the
<a href="http://w3c.github.io/webcomponents/spec/custom/#dfn-attached-callback">Custom Elements</a>
draft specification.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span></h2>
      <pre class="language-dart"><code class="language-dart">void attached() {
  &#47;&#47; For the deprecation period, call the old callback.
  enteredView();
}</code></pre>
    </section>

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