wpt/css/css-transitions/transition-property-006-manual.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Transitions Test: transition-property - background-position</title>
<link rel="author" title="Intel" href="http://www.intel.com">
<link rel="author" title="Shiyou Tan" href="mailto:shiyoux.tan@intel.com">
<link rel="help" href="https://drafts.csswg.org/web-animations-1/#animation-type">
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#background-position">
<meta name="assert" content="Test checks that the 'background-position' property is animatable.">
<style>
  #test {
    border: 1px solid;
    background-image: url("support/cat.png");
    background-position: left;
    background-repeat: no-repeat;
    height: 200px;
    transition-duration: 8s;
    transition-property: background-position;
    transition-timing-function: linear;
  }
</style>
<body>
  <p>Click the image inside of box below. Test passes if the image moves gradually but not immediately from left to right until it stops.</p>
  <div id="test"></div>
  <script>
    (function() {
      var div = document.querySelector("#test");
      div.addEventListener("click", function(evt) {
        div.setAttribute("style", "background-position: right;");
      }, false);
    })();
  </script>
</body>