Codebase Browser
chromium
Go to App

chromium/third_party/blink/web_tests/external/wpt/html/editing/dnd/file/prompt/001.html 

<!DOCTYPE html>
<title>drag &amp; drop - file drop prompt for basic server name</title>
<style>
  body > div {
    height: 200px;
    width: 200px;
    background-color: orange;
  }
</style>

<script>
window.onload = function() {
  if( location.protocol != 'http:' && location.protocol != 'https:' ) {
    document.getElementsByTagName('p')[0].innerHTML = 'This test should be loaded over http or https.';
    return;
  }
  var orange = document.getElementsByTagName('div')[0];
  orange.ondragover = orange.ondragenter = orange.ondrop = function(e) {
    e.preventDefault();
  };
  document.getElementsByTagName('span')[0].innerHTML = location.hostname;
};
</script>

<div></div>

<p>Drag a file from your desktop onto the orange square. A prompt should appear, correctly identifying the server name as <span></span></p>
<noscript><p>Enable JavaScript and reload</p></noscript>