Selectors for strange element names

This should be green (escaped '.' in type selector). <_elem_with_us>This should be blue (escaped '_' in type selector). This should NOT be red (unescaped '.' in type selector). <_second_elem_with_us>This should be purple (unescaped '_' in type selector, OK per CSS2 errata). This should be fuchsia (unescaped '-' in type selector). This should be navy (escaped and unescaped '-' in type selector). There are lots more tests to write here...