title: What does "aria-disabled" do?
body: <p>I found that a code to disable the text in Bootsrap can stood by itself with major class (<code>disabled</code>)</p>
  <pre class="lang-html prettyprint-override"><code>&lt;a class=&quot;nav-link disabled&quot; href=&quot;#&quot; tabindex=&quot;-1&quot; aria-disabled=&quot;true&quot;&gt;
    Disabled
  &lt;/a&gt;
  </code></pre>
  <p>But it can work without the <code>aria-disabled</code> attribute too:</p>
  <pre class="lang-html prettyprint-override"><code>&lt;a class=&quot;nav-link disabled&quot; href=&quot;#&quot; tabindex=&quot;-1&quot;&gt;
    Disabled
  &lt;/a&gt;
  </code></pre>
  <p>Seeing the result is the same, the text is still disabled, I am wondering what is the purpose of the <code>aria</code> attributes?</p>