title: No computed margin for input element, but margin under metrics (and display)
body: <p>I have an input element under in a table cell as follows:</p>
  
  <pre><code>&lt;td&gt;&lt;input class="form-control input-small my-input-narrow" type="number"&gt;&lt;/td&gt;
  </code></pre>
  
  <p>Unfortunately this cell determines the width of the column which is much wider than the width of the input element.</p>
  
  <p>When I inspect the element in Chrome, the computed style tab shows:</p>
  
  <pre><code>margin-bottom: 0px;
  margin-left: 0px;
  margin-right: 0px;
  margin-top: 0px;
  </code></pre>
  
  <p>However, when I go under metrics, and look at the visual, and hover over Margin, it shows a wide area as margin despite the face that it says "-" as the width of the margin. The computed style for the td shows 219px for the width (whereas the input element itself is 33px).</p>
  
  <p>Do you have any suggestions for me to better understand why the rendering is so?</p>
  
  <p>Thanks!</p>