Shared Motion is a revolutionary concept. By making precise, distributed timing and control available as a cloud-based service, Shared Motion spurs a new wave of innovation and opportunity. Our service provides timing with accuracy of a few milliseconds, to all major Web browsers, enabling smooth and flexible user experiences across multiple-devices, networks, and platforms. We have designed Shared Motion to work for millions of concurrent devices, even if they are connected to the same, tightly synchronized experience and spread all over the globe. Shared Motion is proposed as a W3C standard.