PhantomJS is based on WebKit, which is a commonly used HTML rendering engine, us...

sandstrom · on March 15, 2016

I don't think its a terrible idea.

There has been talk in PhantomJS on making multiple engines available. It's the 11th most commented issue[1], out of 1k+ issues.

Sometimes a broadly used browser-engine is important, but other things servo could be useful.

One issue with PhantomJS (on webkit) is that it crashes quite frequently and use a lot of memory[2], areas where Servo may do better.