Some HTML tags, such as br and hr, have no content and cannot have an end tag. What is the complete set of these tags?
Check the table at http://www.w3.org/TR/html4/index/elements.html .
Look at the "EMPTY" column:
http://www.w3.org/TR/html4/index/elements.html
Each tag in a DTD that has EMPTY in the fourth field is empty.
EMPTY
http://www.w3schools.com/tags/default.asp
Anyone with a slash in the tag name. (correction) thanks = O
Html does not force the document to be well formatted, so end tags for certain tags, such as <br> and <hr> , may be omitted, and yet the page loads fine, but it looks like they cannot have end tags </br> and <br /> works fine. There are probably no sections such as content and non-content tags; see this article for more information on http://www.devx.com/projectcool/Article/19816 tags
<br>
<hr>
</br>
<br />