text: <!doctype html>
  <title>Video width and height attributes are not used to infer aspect-ratio</title>
  <script src="/resources/testharness.js"></script>
  <script src="/resources/testharnessreport.js"></script>
  <script src="/common/media.js"></script>
  <style>
    video {
      width: 100%;
      max-width: 100px;
      height: auto;
    }
  </style>
  <body>
  <script>
  let t = async_test("Video width and height attributes are not used to infer aspect-ratio");
  function assert_ratio(img, expected) {
    let epsilon = 0.001;
    assert_approx_equals(parseInt(getComputedStyle(img).width, 10) / parseInt(getComputedStyle(img).height, 10), expected, epsilon);
  }
  // Create and append a new video and immediately check the ratio.
  // This is not racy because the spec requires the user agent to queue a task:
  // https://html.spec.whatwg.org/multipage/media.html#concept-media-load-algorithm
  t.step(function() {
    var video = document.createElement("video");
    video.setAttribute("width", "250");
    video.setAttribute("height", "100");
    video.src = getVideoURI('/media/2x2-green');
    document.body.appendChild(video);
    // Videos default to a size of 300x150px and calculate their aspect ratio
    // based on that before the video is loaded. So this should be 2, ignoring
    // the 2.5 that it would be based on the attributes.
    assert_ratio(video, 2);
  
    video.onloadeddata = t.step_func_done(function() {
      // When loaded this video is square.
      assert_ratio(video, 1);
    });
  });
  </script>
  