When to use <br> line breaks vs CSS positioning?
I've often wondered about the proper use of a <br> line break. Seems that often they are incorrectly used for positioning or clearing content where CSS should instead be used.
W3schoools.org says to use <br> for blank lines, but not for creating or separating paragraphs. Looking over W3C HTML5 spec draft, it's a little clearer that the <br> would be used when content requires a line break such as lines of an address or blank lines in poetry, where intended by the author.
But I'm still interested in any further clarification or input anyone else. I often find myself opting not to use <br> tags but instead just styling elements with the desired clears, margins, paddings, etc to create the space desired.
Not that it's supremely important, but here's the example that got me thinking about this where a popular ("authoritative") site used a <br> that I'm not sure is quite semantic. Here I would've just cleared the <a> from it's siblings via CSS:
<p>Lorem ipsum dolor sit amet, consectetur tempor laborum.</p>
<br>
<a href="#readmore">more >></a>
Answer
To me, linebreaks should only be used inside paragraphs to indicate a new line. Adding line-breaks between paragraphs was used back in the day, when HTML looked like Chop Suey and the semantics of the HTML document looked like someone from preschool used Dreamweaver.
I personally rely on margins and padding for content separation, if I have to use a <br /> it means I've done something wrong. I think lines of an address are a perfect example of proper usage and I would stick to only those scenarios.