Some common block tags

hr

The <hr> element creates a horizontal line in most browsers. It has a semantic meaning as well though as a type of break. I will be using it often to up example filess when I want to display multiple tags in one file.

address

The <address> element indicates that the text is a specific address, perhaps contact information for the author, eg,
1715 Walnut Blvd
Ashtabula, OH 44004

blockquote

The <blockquote> element is used for extended quotations. It is often paired with the the cite attribute in order to show or link the source of the quote.
“If something seems particularly hard, there is usually no value in staying up all night and staring at it. Take a break, take a nap, have a snack, explain what you are having a problem with to someone (or perhaps your dog), and then come back to it with fresh eyes. - Charles Severance”

details

The <details> element is used in conjunction with the <summary> tag and is used to hide/show content. It is one of the tags that was created in response to the repeated using of scripting tags.
Click here to hide/show the additional content. On most browsers clicking on the symbol next to the summary word or phrase will cause this text to appear/disappear. On rare occasions if the details tag isn't supprted, the text is always shown.