16924 2012-05-03 20:44:36 +0000 Microsoft-like filter: progid: is not considered as Vendor extensions 2012-08-30 09:24:43 +0000 1 1 1 Unclassified CSSValidator CSS 3 CSS Validator PC All RESOLVED WONTFIX P2 normal --- 1 mikko dave.null www-validator-cvs oldest_to_newest 67305 0 mikko 2012-05-03 20:44:36 +0000 The following is considered as error even though Vendor extension acceptance is enabled: .sami-button { filter: progid:DXImageTransform.Microsoft.gradient(startColorstr='#292929', endColorstr='#9f9f9f'); } Some random article about this twisted syntax: http://msdn.microsoft.com/en-us/library/ms532847%28v=VS.85%29.aspx 73054 1 ylafon 2012-08-30 09:24:43 +0000 This example does not follow the vendor extension format of CSS (starting with a '-'), so it is at best recognized as an unknown value, at worst, create a parsing error.