CSS Level 3 definition of the attr() function is now on the Microsoft Edge backlog. You can track status updates at https://dev.modern.ie/platform/status/csslevel3attrfunction/
Support for using CSS Transforms on SVG elements is now on the Microsoft Edge backlog with a priority of medium.
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.
This is now tracked on our status page at https://dev.modern.ie/platform/status/backdropfilter/Fábio Alves commented
This is a must have! Specially when Microsoft Project Neon is supposed to use this. Also take a look and Groove Music app. It looks stunning with Backdrop filters.
5,247 votesFábio Alves commented
I need this amazing feature. It made my development richer in Chrome but sadder in Edge.