trimming empty <...>

Cause:

A tag is empty or just containing spaces. Space are ignored, due that introduction spaces are trimmed in HTML. This tag is probably really empty or it can be due to a previous error. Tidy is trying to correct the tags of the page. This can also be a side effect of a tag being implicitely closed by another one just following.

Example:

Good<font size=2></font>
Good<font size=2> </font>
Good<font size=2>
</font>
Good<p><table>...

The last is a sample of a <p> is empty. See the defintion of <p> for more info

Solution:

Remove the tag.

References: