The icons object is set to be 100% the height of the parent object (which is 400px in this case). If you place a 200px object in a 200px parent, this makes sense. The two floating divs above (combined with clear: both applied to #icons), leads this div to flowing down past the end of its parent div.
This is expected and normal behavior. Objects can (and often do) flow out of their parent containers. The overflow css-attribute will help manage this.
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