Calling Text.appendData() / Comment.appendData() without parameter should throw:
https://dom.spec.whatwg.org/#characterdata (parameter is mandatory)
However, WebKit currently does not throw and appends the string "undefined".
Firefox and Chrome match the specification and throw in this case.
Created attachment 261078 [details]
Comment on attachment 261078 [details]
Clearing flags on attachment: 261078
Committed r189676: <http://trac.webkit.org/changeset/189676>
All reviewed patches have been landed. Closing bug.