title: querySelectorAll.style does not work
body: <p>I am writing something in JavaScript that I need to use <code>querySelectorAll.style</code> but it always returns undefined, but it works perfectly with <code>querySelector.style</code>.  How can I make it work properly so I can set the style?</p>
  
  <pre><code>document.querySelector("div#tabs" + tabId + "&gt; div.page").style.display = 'none'; //works
  document.querySelectorAll("div#tabs" + tabId + "&gt; div.page").style.display = 'none';// doesn't work 
  </code></pre>