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According to the CSS 2.1 spec, ::before and ::after can be generated on all elements. Webkit doesn't allow them to be generated on table-internal elements (any element with 'display' of 'table-row', 'table-row-group', 'table-header-group', 'table-footer-group'). It should.
This causes the first two tests in the first column, and all of tests in the second column, to fail.