The W3C error is popping up on you because it's a nesting issue. According to the specs, an inline element cannot contain a block-level element. So first, change the html:
<h4><a href="#">Title</a></h4>
Now you're valid we can take care of the font issue. The problem you're running into is an issue of your page's cascade. To fix the size issue, we just need to set up our CSS like this:
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