That's the most scary thing of all. Although open-sourced webkit is mostly developed by big companies ( Apple, Google, Adobe .. ). Webkit is not perfect. There are a lot of bugs that nobody cares and will care less. Imagine what will happen if there are no competitor and webkit core engineers do whatever they want and still people use their engine. Prefixes like '-webkit-animation' will remain forever and w3c specs will not be a significant for them.