It’s the same version on Mavericks.
On Sierra, I get an empty Safari page again – this seems to be some Safari issue in the developer beta. So I tried OmniWeb instead; in OmniWeb, the WebKit version is again the same as in Hype.
Since Safari does not seem to work correctly in the Sierra developer beta, I retried the mixBlendMode-example (without and with animation) on Sierra & OmniWeb, and in this case, the results are the same as in Mavericks & Safari:
The lower logo is invisible, animation does not work.