I realize this is not a bug, but to me it does deserve some attention for a couple of reasons: 1) A lot of time has passed since the different coloring was implemented, and browsers all support the newer "CSS3" properties. There's no reason to distinguish them and it is unnecessary cognitive noise / confusion. 2) There is no such thing as CSS3. After CSS2 the spec was split up into many different W3C specifications which are developed and versioned independently. So the model of versioning these properties linearly is broken.