<br>
The break cannot be self-closing
<address></address>
For contact details of the author not as a generic element for postal addresses
Could be author info related to an article or section.
<hr>
Represents a block level break and draws a line across the enclosing element. Only has an opening tag. You never use a closing tag and it cannot be self closing.
<img>
<img src="image file name" alt="description of image for 508">
The image tag remains the same except it is no longer self closing,
<mark></mark>
Highlights text this gives a yellow background but you can style it in CSS
<p></p>
Remains unchanged. Specifies a paragraph
<time></time>
At the moment time is not supported by any of the major browsers (April 2012)
Attributes: All Global + datetime and pubdate
datetime
<time datetime="YYYY-MM-DDThh:mm:ssTZD">
date
YYYY - year
MM - month
DD - day of the month
time and separator is required between hours, minutes, seconds
Hours are based on 24 hours
T - represents time
hh - hour
mm - minutes
ss - seconds
TZD - Time Zone Designator(Z specifies Zulu, which is also know as Greenwich Mean Time)
<wbr></wbr>
Word break – for a line break within a word
The details element represents a disclosure widget from which the user can obtain additional information or controls.
HTML Living Standard - Details
<summary></summary>
At the moment only supported by Chrome April 2012
Summery defines a visable heading for details