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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Transitions Test: transition-property - border-left-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-left-width' property is animatable.">
<style>
  #test {
    border: 5px solid blue;
    height: 90px;
    transition-duration: 2s;
    transition-property: border-left-width;
    transition-timing-function: linear;
    width: 90px;
  }
</style>
<body>
  <p>Click the square with blue border below. Test passes if the width of left 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-left-width: 20px;");
      }, false);
    })();
  </script>
</body>