Not when you know what you're doing and don't use auto code generators.
</div> <!-- footer -->
</footer>
</div> <!-- row -->
</div> <!-- container -->
(If you actually look at the website, it will be pretty obvious that I'm no skilled web dev) <div>
<footer>
</footer>
</div>In practice, where the code is coming from 3 or 4 different levels of templating? Bets are off.
But then, Twig has its own weird issues sometimes with adding whitespace so I've given up caring how templated html works altogether in that case.