That's amazing. I hadn't even though about Servo in light of all of this.

In current browsers, JavaScript runs in the same thread as the UI, right? In Servo, how do you do interaction with the DOM like `clientHeight`? It just pauses the entire JS engine while it goes and talks to the UI thread?

Maybe we should be thinking of all of this in terms that map well to Servo's current architecture.

EDIT: What's really exciting about Servo is that hopefully the architecture's parallelism is really sound, even if certain properties of the current web restrain it. Then we can work on ways to remove those properties, and in Servo it's a simple switch to turn on more and more parallelism.