[mikewest]

We're a bit worried about compatibility, certainly. One important thing to note is that WebKit has _tens of thousands_ of layout tests; all of those tests exist right now in the Blink repository, and we're certainly going to continue working with browser vendors in general and the W3C to ensure that we can agree on exactly what standards mean, and how they should be rendered.

We'll be coming at the same problems from different angles, find and fix different bugs, and have the opportunity to peek at how other browsers have done things. I'm quite hopeful that will mean that we'll all end up with better implementations.