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