getElementsByClassName VS querySelectorAll(id) vs querySelectorAll(class) (v131)

Revision 131 of this benchmark created on

Description

Comparing querySelectorAll performance with multiple ids vs getElementsByClassName performance with multiple classes.

Preparation HTML

<div>
  <ul>
    <li>
      <a href="#" id="foo" name="name" class="foo">item 1</a>
    </li>
    <li>
      <a href="#" id="foo" name="name" class="foo">item 2</a>
    </li>
    <li>
      <a href="#" id="foo" name="name" class="foo">item 3</a>
    </li>
    <li>
      <a href="#" id="foo" name="name" class="foo">item 4</a>
    </li>
    <li>
      <a href="#" id="foo" name="name" class="foo">item 5</a>
    </li>
    <li>
      <a href="#" id="foo" name="name" class="foo">item 6</a>
    </li>
    <li>
      <a href="#" id="foo" name="name" class="foo">item 7</a>
    </li>
    <li>
      <a href="#" id="foo" name="name" class="foo">item 8</a>
    </li>
    <li>
      <a href="#" id="foo" name="name" class="foo">item 9</a>
    </li>
    <li>
      <a href="#" id="foo" name="name" class="foo">item 10</a>
    </li>
  </ul>
</div>
<script>
  var nodes;
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
getElementsByClassName
nodes = document.getElementsByClassName('foo');
ready
querySelectorAll (id)
nodes = document.querySelectorAll('#foo');
ready
querySelectorAll (class)
nodes = document.querySelectorAll('.foo');
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.