: '1px'}, {marginTop: '1px'}], 1);
    assert_styles(element, {marginTop: '1px'});
  });
}, 'New animation should apply within script after timeline has started.')

timing_test(function() {
  var player = element.animate([{left: '0px'}, {left: '1000px'}], 10);
  at(1, function() {
    assert_styles(element, {left: '100px'});

    player.currentTime += 1;
    assert_styles(element, {left: '200px'});
  });
}, 'Updated style should be visible after player seek');

timing_test(function() {
  var player = elemen