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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Transitions Test: transition-duration - positive number</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" title="2.2. The 'transition-duration' Property" href="http://www.w3.org/TR/css3-transitions/#transition-duration-property">
+<meta name="assert" content="The 'transition-duration' property set positive number specifies the time that transition from the old value to the new value should take.">
+<style>
+  div {
+    background-color: yellow;
+    height: 100px;
+    transition-duration: 2s;
+    transition-property: width;
+    transition-timing-function: linear;
+    width: 100px;
+  }
+</style>
+<body>
+  <p>Click the yellow square below. Test passes if the width of square stops growing when the number inside square is '2'.</p>
+  <div>0</div>
+  <script>
+    (function() {
+      var div = document.querySelector("div");
+      div.addEventListener("click", function(evt) {
+        div.setAttribute("style", "width: 200px;");
+        setInterval(function() {
+          var timer = parseInt(div.textContent, 10);
+          timer++;
+          div.textContent = timer;
+        }, 1000);
+      }, false);
+    })();
+  </script>
+</body>