Output of this test should match HTML5 (no strict SGML comment parsing).

Basic comments:
PASSED

Comment series:
PASSED

Dash runs:
PASSED PASSED PASSED

Empty comments:
PASSED PASSED PASSED

Multiple lines:
PASSED

Compatibility:
PASSED PASSED

White space after comment close:

Extra comment after markup declaration close:
FAILED: extra comment end and markup declaration close -->
PASSED (outer nested comment) -->