missing </...>

Cause:

A closing tag is missing. Most HTML tags need to be closed, though the exact set of tags varies according to which XHTML 1.0 and higher, however, it needs to be closed with a trailing slash, eg <img />. Such tags are called "empty elements".

Example 1 - Missing Closure (Normal)

Good<head><title>hello</head>
Good<head><title>hello</title></head>

Example 2 - Missing Closure (Empty Elements)

Good<img src="whatever.jpg" width="20" height="400" alt="Whatever">
Good<img src="whatever.jpg" width="20" height="400" alt="Whatever" />

Solution:

Add the closing tag. Usually the is the same as the opening tag. As noted above, however, XHTML requires some tags to be closed with a trailing slash. According to XHTML 1.0 Transitional DTD, the following tags are "empty":


References: