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test case 1: selected grammar = css1 [attr] {} is incorrectly reported as valid css1 (attribute test selectors are not part of css1). -- test case 2: selected grammar = css1 [attr=val] {} is incorrectly reported as valid css1 (attribute test selectors are not part of css1).
Fixed on http://qa-dev.w3.org:8001/css-validator/