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Using the CSS level 3 profile, the input .a { text-overflow: clip; } causes the incorrect error message Parse Error [empty string] This seems to happen no matter what value is specified for text-overflow. This bug was previously reported in the www-validator-css list in 2008: http://lists.w3.org/Archives/Public/www-validator-css/2008Jul/0006.html
Property now implemented, and your test pass. Cheers,