Notice: replacing <...> by <...>

Cause:

This is due to:
- a bad order of the HTML tags
- or to an additional tag that should not be there
- or to a closing tags of an explitely or implicitely closed tag

Samples:

replacing </p> by <br>

BAD (explicit close)   <p>hello</p></p>
GOOD                   <p>hello</p><br>  

BAD (implicit close)   <p>abc<br><table>...</table></p>
GOOD                   <p>abc<br></p><table>...</table> 

In the above sample, the <p> tag is implicitely closed when a new 'block-level' tag like <table> is opened. For more info, read the definition of <p>.

References:

W3C block : http://www.w3.org/TR/html4/struct/global.html#block-inline