title: Block Level Elements inside Inline elements
body: <p>The W3C Validator tells me I can't put block-level elements inside inline elements. Makes sense...</p>
  
  <p>but what if I'm using CSS to change that block-level element into an inline element?</p>
  
  <p>And what if I'm using CSS to convert an inline element into a block-level element (when inside another inline element)?</p>
  
  <p>The Validator doesn't pick up on this obviously, but is it wrong?</p>
  
  <p>(I'm not actually doing this, I'm just wondering about best-practice)</p>