This is currently on the backlog with a medium priority. You can track changes at https://dev.modern.ie/platform/status/webgl20/
SVG2 is now on the Microsoft Edge backlog. You can track status updates at https://dev.modern.ie/platform/status/svg2/Marino Posadas commented
Absolutely agree. For many scenarios, canvas is insufficient, and given the lack of support of SMIL Animations that would be a great point...)
See http://blogs.windows.com/msedgedev/2015/07/14/bringing-componentization-to-the-web-an-overview-of-web-components/ (part 1) and https://blogs.windows.com/msedgedev/2015/07/15/microsoft-edge-and-web-components/ (part 2) for more information on our Web Components thoughts, plans, and roadmap.