title: How do I get all elements of a particular HTML tag in javascript?
body: <p>I need to hide all elements of type 'section' in my document apart from one with a particular ID.</p>
  
  <p>In jquery this would be easy</p>
  
  <pre><code>$("section").hide();
  $("section#myId").show();
  </code></pre>
  
  <p>How would I do this without jquery??</p>
  
  <p>(I need it to happen as soon as the page loads and to not be noticable). I also need it to work cross browser.</p>
  
  <p>Thanks.</p>