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For example, this bit of CSS fails and I could not find a way for the validator to accept it: .sami-button:hover, #reservation-link:hover { background: -webkit-gradient(linear, left top, left bottom, from(#292929), to(#9f9f9f)); background: -moz-linear-gradient(top, #292929, #9f9f9f); } Unfortunately for some elements like background vendor prefixes in values are still being needed.
They are now generating warning, as values can't be validated.