UserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36

Steps to reproduce the problem:
Currently when hovering above an element that has `display: grid`, the CSS grid tracks will display. It would be awesome to be able to toggle this on a global level.

What is the expected behavior?
The way that I would expect this to work is to have an option within settings. This could also be toggled on/off through the command palette. 

When toggled on, it would show all grids. Nested grids would show in a different color, so they're easily recognized as nested.

What went wrong?
n/a

Did this work before? No 

Chrome version: 65.0.3325.181  Channel: stable
OS Version: OS X 10.11.6
Flash Version: