title: Div following with cursor: edges become dark on move
body: <p>I'm trying to implement div that follows with cursor and I made simple example of it that uses</p>
  
  <pre><code>$(document).on('mousemove', function(event) {
      $('#pursuer').css({
        top: event.clientY + 10 + 'px',
        left: event.clientX + 10 + 'px',
      });
    });
  </code></pre>
  
  <p>Full <a href="http://plnkr.co/edit/7p38PED9ZhkuX7fnMuR1?p=preview" rel="nofollow">example is here</a>.</p>
  
  <p>But there is the bug - when I moving the cursor the edges of my div get dark. 
  Firstly I was thinking that the problem lay in color with transparency:</p>
  
  <pre><code>background-color: rgba(220, 165, 167, .4);
  </code></pre>
  
  <p>but changing to hex </p>
  
  <pre><code>background-color: #f0dadb;
  </code></pre>
  
  <p>didn't help</p>
  
  <p>It there a way to avoid this bad effect?</p>
  
  <p>UPD: I'm using Chrome 42.0.2 / FF 37.0.2 / Opera 29 on windows 8.1. Reproduced in each one.
  But the most strangest thing is that I really can't reproduce it on OSX (in any browser above). Even more - I can't screenshot the problem in windows because screenshot shows that everything is ok, but actually it isn't</p>
  
  <p>UPD 2: as I noted in comment - I have no any additional plugins and extensions in browsers. Also I can reproduce this issue only on 2 of 3 windows PC (all with windows 8.1 aboard)...trying to find out the differences. Not sure, but looks like the problem in OS.</p>
  
  <p>UPD 3: as advised I did following:</p>
  
  <p>1) removed background, added text, added border (with radius and without radius) - the problem didn't appear</p>
  
  <p>2) removed background, added additional div filler:</p>
  
  <pre><code>&lt;div id='pursuer'&gt;
    &lt;div id='filler'&gt;&lt;/div&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>with styles</p>
  
  <pre><code>#filler {
    position: relative;
  
    background-color: #f0dadb;
    border-radius: 35px;
    width: 100%;
    height: 100%;
  }
  </code></pre>
  
  <p>and the problem appeared again. Hence, the cause in background</p>
  
  <p>UPD 4: not only in background-color - if I put an image as a background then I can see the same issue</p>