transition-property-031-manual.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Transitions Test: transition-property - opacity</title>
<link rel="author" title="Intel" href="http://www.intel.com">
<link rel="author" title="Shiyou Tan" href="mailto:[email protected]">
<link rel="help" href="https://drafts.csswg.org/web-animations-1/#animation-type">
<link rel="help" href="https://drafts.csswg.org/css-color-3/#transparency">
<meta name="assert" content="Test checks that the 'opacity' property is animatable.">
<style>
  #test {
    background-color: red;
    height: 100px;
    opacity: 1;
    transition-duration: 2s;
    transition-property: opacity;
    transition-timing-function: linear;
    width: 100px;
  }
</style>
<body>
  <p>Click the red square below. Test passes if the red square blurs gradually not immediately until it disappears.</p>
  <div id="test"></div>
  <script>
    (function() {
      var test = document.querySelector("#test");
      test.addEventListener("click", function(evt) {
        test.setAttribute("style", "opacity: 0;");
      }, false);
    })();
  </script>
</body>

chromium/third_party/blink/web_tests/external/wpt/css/css-transitions/transition-property-031-manual.html