Blink and WebKit are not very similar anymore. The fork was 7 years ago and since then Blink has been heavily changed including a whole new layout engine (Layo

Blink and WebKit are not very similar anymore. The fork was 7 years ago and since then Blink has been heavily changed including a whole new layout engine (LayoutNG), a new painting system, a redone compositing system, a prioritizing task scheduler and a bunch of other architectural differences. Chrome has also used a different compositor backend, painting backend, and JS engine compared to WebKit since even before the fork. That demos like this work on Safari is probably more about web standards, web platform tests, and where developers test than engine lineage.