In Internet Explorer I can attach my own CSS: for instance, in IE 11 using Tools → Internet Options → General tab → Appearance section → Accessibility → User style sheet → Format documents using my style sheet (https://i.sstatic.net/gwHYs.png). In other browsers I use addons like Stylish etc.
Is there any way to do the same in Microsoft Edge? If not through interface options, then maybe through editing its files, or registry, or whatever?
NOTE: This answer only applies to the "Spartan" Edge browser: 2015 to 2019, and not the Chromium-based Edge browser.
(Disclaimer: I have worked on Microsoft Edge)
This is not a supported scenario at present:
https://msdn.microsoft.com/en-us/library/mt227929%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396
Microsoft Edge does not support user stylesheets.
An extensibility system is coming for Microsoft Edge in an upcoming release, and user stylesheets will be a feature that an extension could provide.
