Why is this inline-block element pushed downward?

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Following is my code and I want to understand that why #firstDiv is being pushed downward by all browsers. I really want to understand 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 :))

And I know that its overflow:hidden; which is causing it but not sure that why its pushing that div downward.

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;
}
<div id="container">
  <div id="firstDiv">FIRST</div>
  <div id="secondDiv">SECOND</div>
  <div id="thirdDiv">THIRD
    <br>some more content<br> some more content
  </div>
</div>

http://jsfiddle.net/WGCyu/.

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