The older HTML element named in the message has been deprecated by the World-Wide-Web Consortium. As their HTML 4.01 Specification explains at 4 Conformance: requirements and recommendations:
A deprecated element or attribute is one that has been outdated by newer constructs.
The HTML 4.01 Specification includes in its Index of Attributes 47 deprecated HTML 3.2 attributes that should be replaced by newer constructs.
To correct this error