Servo does execute JS and does support webgl (and some but not all of webgl2 if you enable the feature: https://book.servo.org/design-documentation/experimental

Servo does execute JS and does support webgl (and some but not all of webgl2 if you enable the feature: https://book.servo.org/design-documentation/experimental-features.html https://book.servo.org/design-documentation/experimental-fea...).