Assuming you&#x27;re talking about WebRender?<p><a href="http:&#x2F;&#x2F;pcwalton.github.io&#x2F;slides&#x2F;webrender-talk-022016&#x2F;" rel="nofollow">http:&#x2F;&#x2F;pcwalton.github.io&#x2F;slides&#x2F;webrender-talk-022016&#x2F;</a><p>... which is notable because it is <i>not</i> immediate mode but the first retained mode renderer in a browser.  Also, they used Rust to cut down on the time spent debugging threading issues.