Perl extension for testing HTML output

 Test::HTML::Content is a module to test the HTML output of your programs in
 simple test scripts. It can test a scalar (presumably containing HTML) for
 the presence (or absence, or a specific number) of tags having (or lacking)
 specific attributes. Unspecified attributes are ignored, and the attribute
 values can be specified as either scalars (meaning a match succeeds if the
 strings are identical) or regular expressions (meaning that a match succeeds
 if the actual attribute value is matched by the given RE) or undef (meaning
 that the attribute must not be present).