please read the comments of this article before reading its content or upvoting this anymore. it's grossly inaccurate. in particular, this comment which mostly nails it. again, i'm not the author of this, just quoting Paul Armstrong:

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It's most unfortunate that you mis-used half of the items in this post.

cite should be used when you're actually _citing_ something from a source, like if you're using a blockquote or q element.

optgroup should contain a set of options, not be closed before the options. Your "live demo" doesn't show any visual difference because of your improper usage.

acronym is used for acronyms. Defining acronym, "a word formed from the initial letters of the several words in the name"… The usage in your example just hurts my brain.

According the HTML specs, address is used to denote the address of the page creator: "The ADDRESS element may be used by authors to supply contact information for a document or a major part of a document such as a form. This element often appears at the beginning or end of a document." See: http://www.w3.org/TR/REC-html40/struct/global.html#h-7.5.6

Pretty sad that you didn't use labels in your fieldset example.

The abbr example is a better example of an acronym. abbr, or Abbreviation is a "shortened form of a word" like ‘management' -> ‘mgmt'.

rel should be used to describe the relationship of the text to the current tag. W3C says, "This attribute describes the relationship from the current document to the anchor specified by the href attribute. The value of this attribute is a space-separated list of link types."

wbr is not in any HTML spec. It is a non-standard tag that was added by Netscape, and later dropped around Netscape 4 or 5.

I'm incredibly disappointed by the inaccuracies that you're giving people who might not know better.