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<!DOCTYPE html>
<title>drag &amp; drop - drop interrupted by alert must not break mouse interaction with UI</title>
<style>
  body > div {
    height: 200px;
    width: 200px;
    background-color: orange;
  }
  body > div + div {
    margin-top: 10px;
    height: 200px;
    width: 200px;
    background-color: blue;
  }
</style>

<script>
window.onload = function() {
  var orange = document.getElementsByTagName('div')[0], blue = document.getElementsByTagName('div')[1];
  orange.ondragstart = function(e) {
    e.dataTransfer.effectAllowed = 'copy';
    e.dataTransfer.setData('text', 'dummy text');
  };
  blue.ondragover = blue.ondragenter = function(e) {
    e.preventDefault();
    e.dataTransfer.dropEffect = 'copy';
  };
  blue.ondrop = function(e) {
    e.preventDefault();
    alert('It should ideally be possible to dismiss this dialog with your mouse/pointing device (do not use mouse gestures).');
  };
};
</script>

<p>Drag the orange square onto the blue square.</p>
<div draggable="true"></div>
<div></div>

<noscript><p>Enable JavaScript and reload</p></noscript>