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chromium/third_party/blink/manual_tests/input-type-file-drag-drop.html 

<body>
<div style="background-color: black;" width="300">
<input type=file>
</div>
<div style="background-color: blue;" width="300">
<input type=file>
</div>
<input type=file>
<p>
&lt;input type="file"&gt; should be able to support drag and drop of files.  Use the above controls to demonstrate:
</p>
<ol>
<li> Accepting normal file drags (indicating accpetance during hover).
<li> Rejecting diretory and non-normal file drags.
<li> Dropping a symlink'd file should accpect/show/upload the target, not the symlink itself.
<li> Rejecting of file-promise drags (this is probably a bug, not a feature).
</ol>
</body>