<!doctype html>
<title>An animation of an attribute ('class') does not change the DOM attribute value</title>
<link rel="help" href="https://www.w3.org/TR/2001/REC-smil-animation-20010904/#BasicAnim">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  .animated {
      fill: blue;
  }
</style>
<svg>
  <rect class="base">
    <set attributeName="class" to="animated"/>
  </rect>
  <rect>
    <set attributeName="class" to="animated"/>
  </rect>
</svg>
<script>
  async_test(t => {
    onload = t.step_func(() => {
      requestAnimationFrame(t.step_func_done(() => {
        let rects = document.getElementsByTagName('rect');
        assert_true(rects[0].hasAttribute('class'));
        assert_equals(rects[0].getAttribute('class'), 'base');
        assert_equals(getComputedStyle(rects[0]).getPropertyValue('fill'), 'rgb(0, 0, 255)');

        assert_false(rects[1].hasAttribute('class'));
        assert_equals(rects[1].getAttribute('class'), null);
        assert_equals(getComputedStyle(rects[0]).getPropertyValue('fill'), 'rgb(0, 0, 255)');
      }));
    });
  });
</script>
