On October 17th, Microsoft’s Edge browser shipped its implementation of CSS Grid. This is a milestone for a number of reasons. First, it means that all major browsers now support this incredible layout tool. Second, it means that all major browsers rolled out their implementations in a single year(! ), a terrific example of standards success and cross-browser collaboration. But third, and perhaps most interestingly, it closes the loop on a process that has been more than 20 years in the making.