title: Loading a JavaScript file using both defer and async
body: <p>What would be the loading order of these two JavaScripts?</p>
  
  <pre><code>&lt;script src="a.js"&gt;
  &lt;script src="b.js" defer async&gt;
  </code></pre>
  
  <p>What happens to <strong>b.js</strong> that has both <strong>defer</strong> and <strong>async</strong>?</p>