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Safari 9 (10601.1.35.2.4), Mac OS X 10.10.4
According to the CSS2 spec  missing elements in the table model
should be assumed in order for the table model to work. Safari does not
seem to generate anonymous table objects for the missing elements.
(needs reference). We should update this phabricator task if we find an upstream Safari bug. Note the bug is also in Safari 7.