dart-lang/html5lib — pull request #55 by kevmoo (2013-01-27 20:27:26+00:00)
Title: Fixed test analysis by fully implementing Collection members

Error was:

file:/html5lib.dart/lib/dom.dart:608:7: Concrete class FilteredElementList has unimplemented member(s)
# From Collection:
void remove(Object)
607: // I fixed this to extend Collection and implement removeAt and first.
608: class FilteredElementList extends Collection implements List {