Lazy HTML :(
Poking through other developers' HTML pages I sometimes come across markup like this:
<br> <br> <br>
It's generally used to just add some space between block elements. My instinctive reaction is a mixture of horror and disbelief. I can't remove it quick enough and get some CSS to control it instead.
Thinking about it a little deeper, this tag gets misused a lot. There's a big difference between a semantic break between 2 bits of content and just shifting something down a line because it looks better at the time. The example above using several line breaks consecutively is, to my mind, just plain wrong. A break is used to separate content and its semantic meaning here is trying to separate other breaks.
To be fair to the other developers there's a good chance it's some visual editor doing a bad job rather than it being hand coded this way but the result is the same.
HTML should be about conveying the meaning of the content, not just a way of putting text on screen. Adding gaps or breaks between bits of content needs to be considered too.