title: Why is this inline-block element pushed downward?
body: <p>Following is my code and I want to understand that <strong>why</strong> <code>#firstDiv</code> is being pushed downward by all browsers. I really want to <em>understand</em> the inner workings of the fact that why its being pushed downward rather than pulling it upward by one way or another. (and I know how to align their tops :))</p>
  <p>And I know that its <code>overflow:hidden;</code> which is causing it but not sure that why its pushing that <code>div</code> downward.</p>
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-css lang-css prettyprint-override"><code>body {
    width: 350px;
    margin: 0px auto;
  }
  
  #container {
    border: 15px solid orange;
  }
  
  #firstDiv {
    border: 10px solid brown;
    display: inline-block;
    width: 70px;
    overflow: hidden;
  }
  
  #secondDiv {
    border: 10px solid skyblue;
    float: left;
    width: 70px;
  }
  
  #thirdDiv {
    display: inline-block;
    border: 5px solid yellowgreen;
  }</code></pre>
  <pre class="snippet-code-html lang-html prettyprint-override"><code>&lt;div id="container"&gt;
    &lt;div id="firstDiv"&gt;FIRST&lt;/div&gt;
    &lt;div id="secondDiv"&gt;SECOND&lt;/div&gt;
    &lt;div id="thirdDiv"&gt;THIRD
      &lt;br&gt;some more content&lt;br&gt; some more content
    &lt;/div&gt;
  &lt;/div&gt;</code></pre>
  </div>
  </div>
  </p>
  <p><a href="http://jsfiddle.net/WGCyu/" rel="nofollow noreferrer">http://jsfiddle.net/WGCyu/</a>.</p>