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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Transitions Test: transition-property - border-top-width</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/#the-border-width">
+<meta name="assert" content="Test checks that the 'border-top-width' property is animatable.">
+<style>
+  #test {
+    border: 5px solid blue;
+    height: 90px;
+    transition-duration: 2s;
+    transition-property: border-top-width;
+    transition-timing-function: linear;
+    width: 90px;
+  }
+</style>
+<body>
+  <p>Click the square with blue border below. Test passes if the height of top border grows gradually not immediately until it stops.</p>
+  <div id="test"></div>
+  <script>
+    (function() {
+      var div = document.querySelector("#test");
+      div.addEventListener("click", function(evt) {
+        div.setAttribute("style", "border-top-width: 20px;");
+      }, false);
+    })();
+  </script>
+</body>