Its obvious that those tests that depend on external resources are flakey, the web archived is created immediately, w/o waiting for the files to be loaded.
for <cursor> and <feImage> we have no precise way to detect that, but moving the <script> after the content fixes it easily. Patch coming.
Created attachment 124103 [details]
Created attachment 124105 [details]
Comment on attachment 124105 [details]
Another time based flakeyness...
Committed r105992: <http://trac.webkit.org/changeset/105992>