"Microsoft Edge DevTools comes with the 3D view panel that makes it possible to see your site 3 dimensions to debug DOM nesting or positioning issues, z-index problems, and painting performance problems."
Yes. I was on the team back then. It was cool bit had to be removed when an architecture change happened and it was too costly to migrate this tool.
The Edge one goes further though as it does z-index stacking context tree, and composited layers too.
Slow and laggy. Visualization looks purely software rendered at 5-20fps. YT clip is 60Hz but even presenters camera is choppy (Im guessing dslr set to 24Hz).
"Microsoft Edge DevTools comes with the 3D view panel that makes it possible to see your site 3 dimensions to debug DOM nesting or positioning issues, z-index problems, and painting performance problems."