element should not contain HTML
This value appears to contain HTML markup. Be advised that clients will behave unpredictably in the presence of such markup: some will interpret it as HTML, others will strip it, and still others will display the markup itself.
Consider removing the markup.
If the purpose of the markup is to escape the use of an HTML entity, use this table to find the Entity Number to replace the escaped version of the Entity Name. For example:
Encoding of the characters
are especially problematic in places like RSS 2.0 titles. For the widest
recommends the use of the hexadecimal character reference
&" to represent "
<" to represent "
Not clear? Disagree?
You might be able to find help in one of these fine resources.