An anonymous reader writes: As Metacity (the Gnome window manager) progresses into Mutter, the question of CSS themes and how to implement them has come up. One of the proposals was WebKit, which the author asked more specifically about on his blog. It seems that WebKit, being a very fast rendering engine, would allow Mutter to have unprecedented power, not to mention being nearly future-proofed. As a major bonus, going this way could allow Gnome to share themes with KDE, which is apparently headed the WebKit way already. Many people will reflexively recoil at the idea of a browser being mixed with a window manager, but it's important to remember that WebKit it not a web browser but a rendering engine, and it's not where all the security issues come from. So, what are the real technical issues at stake here? What are the pros and cons of using WebKit here?