Demo: merge authoring#4083

ddbeck wants to merge 2 commits into

web-platform-dx:mainweb-platform-dx/web-features:mainfrom

ddbeck:merge-grid-animation-into-grid/xomvsqxyqzxlddbeck/web-features:merge-grid-animation-into-grid/xomvsqxyqzxlCopy head branch name to clipboard