@Aklapper:

What this task is trying to achieve is the ability to pin websites on cross-platforms: Windows 8.* and 10, Android (Chrome browser), Safari browser, and on the iOS platform.

Currently, when you just use $wgFavicon in mw.v 1.26.2, it generates this: (correct me if I'm wrong)

<link rel="shortcut icon" href="<directory-path>/favicon.ico">

• In Windows 10, you have the ability to add a website as a Windows tile, if it has certain metadata tags with the correct values of the attributes, and requires a .png file type.
  • http://www.makeuseof.com/tag/use-chrome-create-windows-10-app-website/
  • http://www.pcworld.com/article/3007760/windows/how-to-add-any-website-to-windows-10s-start-menu.html
• In Safari 9 for Mac OS X EI Captain, you have an ability to pin tabs and it'll generate a favicon, but it won't use the .ico file. It requires support for SVG favicons however.
• In iOS, you have an ability to pin a website to the home screen but requires different favicon dimensions. I'm assuming this is already fixed with $wgAppleTouchIcon but I don't know how stable it is and how recently it's been tested out.
• In Android Chrome, you have the same ability of pinning website to the home screen, but still requires different favicon dimensions, and also requires a .png type.

Recommend merging T28211 into this one, there's some old notes there.

Sorry, accidentally got in a mess with the tickets here!

Thanks Samantha to have sorted the different tasks I created for these favicons and assimilated icons.