3D view is enabled by default in the Canary branch – to enable it in other branches, open the DevTools Experiments settings Ctrl Shift P Experim With our first 3D View experiment, we were able to get incredible feedback from Twitter and from the feedback button. This encouraged us to conduct further usability studies to improve the tool. Along the way, we received plenty of requests for CSS z index debugging as a feature, and felt that the 3D View would be a great vehicle to try it...

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