Is it wrong to change a block element to inline with CSS if it contains another block element?

Question

I know it\'s wrong to put a block element inside an inline element, but what about the following?

Imagine this valid markup:

This         


        
      

Answer 1

I don't know off the top of my head if this validates any rules but I would recommend using the W3C HTML Validator and the W3C CSS Validator to determine that. Hope this is helpful!