Google Open Source Blog: CSS Selector Shell Released So far this tool has proven quite useful by showing what happens when developers try to make use of CSS selector syntax that may not be supported in a particular browser. Specifically, it can show how and perhaps why a particular CSS hack works in some browsers and how it is ignored in others. It can also demonstrate the potential for harm when using unsupported CSS syntax in some browsers. By fjordaanin Public bookmarkswith browsercsscsstextgoogleselectorshellsupporttest