New icon format for pinned tabs in Safari 9 (El Capitan)?

Question

safari

It seems that Apple has imposed another new icon format on us - icons for pinned tabs in Safari on OS X El Capitan. Take a look at the example of Yandex:

Only here is how it is implemented, how to create such an icon is the question. Anyone in the subject?

Answer 1

https://developer.apple.com/library/mac/releasenot...

Answer 2

Alexander Petrov but this does not work :(
Although, for example, in the same VK - there is an icon, but there is no code with an svg icon and theme color:

Answer 3

You have an error in the link from the code.
either
uwebdesign.ru/uwebdesign2.svg
or
/uwebdesign2.svg