Manual test of a cyrillic accesskey value

There is a button, with accesskey="я".

Expected result

A shortcut based on "я" plus modifiers should either activate or focus the button. The button will try to open a window with the Github repo for this test, so you can update the results section :)

Value of the accessKey DOM attribute:

Results

This test is on github to enable Pull Requests…

Opera 12, 64-bit Ubuntu Linux 14.04
shows accesskey as "(null)"
Shortcut can be activated in the accesskey menu with a mouse
Firefox 42, MacOS 10.10.5
ctrl-alt-"я" presses the button, opening the github page
Firefox exposes "^⌥я" as a value of the accessKeyLabel DOM attribute
Firefox 42, 64-bit Ubuntu Linux 14.04
(no cyrillic keyboard)
Firefox exposes "Alt+Shift+я" as a value of the accessKeyLabel DOM attribute
Safari 9.01, MacOS 10.10.5
ctrl-alt-"я" presses the button, opening the github page
Vivaldi 1.0.303.52 beta, MacOS 10.10.5 (based on Chromium)
ctrl-alt-"я" focuses and presses the button.
Yandex browser 15.4.2272.3909 beta, MacOS 10.10.5 (based on Chromium)
ctrl-alt-"я" focuses and presses the button. The attempt to open a window is blocked, as if it were not triggered by a user action, but the button retains focus.
All tested user agents reflect the content of the HTML attribute in the DOM attribute accessKey

Discussion

The accesskey attribute was first defined in HTML 4, and an improved version was redefined in HTML5

The "я" key is standard on cyrillic keyboards. A browser that implements either the HTML4 or HTML5 version of accesskey will use it as the base of a shortcut.