<!DOCTYPE html>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/utils.js"></script>
<style>
  #masked {
    width: 0px;
    height: 100px;
    -webkit-mask-image: url(../resources/circle.svg);
    mask-image: url(../resources/circle.svg);
  }
</style>
<div id='masked'></div>
<script>
setup({"hide_test_state": true});
promise_test(async t => {
  const onload = new Promise(r => window.addEventListener('load', r));
  await onload;
  return assertNoFirstContentfulPaint(t).then(() => {
    document.getElementById('masked').style.width = '100px';
  }).then(() => {
    return assertFirstContentfulPaint(t);
  });
}, 'Mask image triggers First Contentful Paint.');
</script>
</body>
