video-latency-hint.html | Explore in Territory

<!DOCTYPE html>
<title>Test video.latencyHint object and content attributes</title>
<script src='../resources/testharness.js'></script>
<script src='../resources/testharnessreport.js'></script>
<script>
test(function(t) {
  let video = document.createElement('video');
  assert_equals(video.latencyHint, NaN);
  assert_equals(video.getAttribute('latencyhint'), null);
}, 'Test initial unset values');

test(function(t) {
  let video = document.createElement('video');

  // First set the IDL attributes. Verify reflection.

  video.latencyHint = 0;
  assert_equals(video.latencyHint, 0);
  assert_equals(video.getAttribute('latencyhint'), '0');

  video.latencyHint = 0.5;
  assert_equals(video.latencyHint, 0.5);
  assert_equals(video.getAttribute('latencyhint'), '0.5');

  video.latencyHint = 1;
  assert_equals(video.latencyHint, 1);
  assert_equals(video.getAttribute('latencyhint'), '1');

  // Now set the content attribute. Verify reflection.

  video.setAttribute('latencyhint', '0');
  assert_equals(video.latencyHint, 0);
  assert_equals(video.getAttribute('latencyhint'), '0');

  video.setAttribute('latencyhint', '0.5');
  assert_equals(video.latencyHint, 0.5);
  assert_equals(video.getAttribute('latencyhint'), '0.5');

  video.setAttribute('latencyhint', '1');
  assert_equals(video.latencyHint, 1);
  assert_equals(video.getAttribute('latencyhint'), '1');

}, 'Test setting valid values');

test(function(t) {
  let video = document.createElement('video');

  // Start with a valid value.
  video.latencyHint = 0;
  assert_equals(video.latencyHint, 0);
  assert_equals(video.getAttribute('latencyhint'), '0');

  // Values less than zero are invalid. Verify invalid values still update
  // the content attribute, but the IDL attribute reflects that the default
  // value (NaN) was applied.
  video.latencyHint = -1;
  assert_equals(video.getAttribute('latencyhint'), '-1');
  assert_equals(video.latencyHint, NaN);

  // Again, start with a valid value.
  video.latencyHint = 0;
  assert_equals(video.latencyHint, 0);
  assert_equals(video.getAttribute('latencyhint'), '0');

  // Non-finite values are caught earlier by IDL definition. They will have
  // no effect on either attribute type.
  assert_throws_js(TypeError, () => {
    video.latencyHint = Infinity;
  }, 'latencyHint should throw for non-finite values');
  assert_equals(video.latencyHint, 0);
  assert_equals(video.getAttribute('latencyhint'), '0');

  assert_throws_js(TypeError, () => {
    video.latencyHint = NaN;
  }, 'latencyHint should throw for non-finite values');
  assert_equals(video.latencyHint, 0);
  assert_equals(video.getAttribute('latencyhint'), '0');
}, 'Test setting invalid values from IDL attribute');

test(function(t) {
  let video = document.createElement('video');

  // Start with a valid value.
  video.latencyHint = 0;
  assert_equals(video.latencyHint, 0);
  assert_equals(video.getAttribute('latencyhint'), '0');

  // Values less than zero are invalid. Verify invalid values still update
  // the content attribute, but the IDL attribute reflects that the default
  // value (NaN) was applied.
  video.setAttribute('latencyhint', '-1');
  assert_equals(video.getAttribute('latencyhint'), '-1');
  assert_equals(video.latencyHint, NaN);

  // Again, start with a valid value.
  video.setAttribute('latencyhint', '0');
  assert_equals(video.latencyHint, 0);
  assert_equals(video.getAttribute('latencyhint'), '0');

  // Non-finite values are disallowed by web IDL, but that auto-validation
  // isn't feasible when setting by attribute (unlike the previous test).
  // We should instead see IDL attribute value changes to the default, NaN.
  video.setAttribute('latencyhint', 'Infinity');
  assert_equals(video.getAttribute('latencyhint'), 'Infinity');
  assert_equals(video.latencyHint, NaN);

  video.setAttribute('latencyhint', 'NaN');
  assert_equals(video.getAttribute('latencyhint'), 'NaN');
  assert_equals(video.latencyHint, NaN);

  // Completely bogus values should have the same behavior as above.
  video.setAttribute('latencyhint', 'foo');
  assert_equals(video.getAttribute('latencyhint'), 'foo');
  assert_equals(video.latencyHint, NaN);
}, 'Test setting invalid values from content attribute');

</script>
chromium/third_party/blink/web_tests/media/video-latency-hint.html
