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chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/draggable-areas/transform.html 

<!DOCTYPe html>
<meta charset='utf-8'>
<title>drag and drop – draggable area boundaries – transformed elements</title>
<style>
a {
  display: block;
  height: 200px;
  width: 200px;
  background-color: blue;
  margin-left: 100px;
  -moz-transform: rotate(-45deg) skew(15deg, 15deg);
  -o-transform: rotate(-45deg) skew(15deg, 15deg);
  -webkit-transform: rotate(-45deg) skew(15deg, 15deg);
  transform: rotate(-45deg) skew(15deg, 15deg);
}
</style>
<ol>
 <li>Try dragging the blue box below by clicking and holding <em>just</em>
 outside its skewed edges. It should <em>not</em> be draggable.</li>
 <li><p>Drag the blue box below. It should be draggable.</p>

<a draggable="true" ondragstart="event.dataTransfer.effectAllowed ='copy'">TEST</a>