This doesn't seem to be documented anywhere - all of the mentions I find about this date from around 2013-ish. There's nothing about it in Chrome's help site e

This doesn't seem to be documented anywhere - all of the mentions I find about this date from around 2013-ish. There's nothing about it in Chrome's help site either: https://support.google.com/chrome/search?q=user+stylesheet&from_promoted_search=true https://support.google.com/chrome/search?q=user+stylesheet&f... https://support.google.com/chrome/search?q=Custom.css https://support.google.com/chrome/search?q=Custom.css