UserAgent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2739.0 Safari/537.36

Example URL:
https://dvcs.w3.org/hg/d4e/raw-file/tip/key-event-test.html

Steps to reproduce the problem:
1. Load https://dvcs.w3.org/hg/d4e/raw-file/tip/key-event-test.html
2. Press 英数 key which is CaplLock key without Shift

What is the expected behavior?
The KeyboardEvent.key value should be "Alphanumeric", not "Eisu".

What went wrong?
"Eisu" is a special key on Mac Japanese keyboard. "Alphanumeric" is a good key value for Japanese PC keyboard's 英数 key's usual keysym (on my environment, the keysym value is Eisu_toggle).

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? N/A 

Does this work in other browsers? Yes 

Chrome version: 52.0.2739.0  Channel: canary
OS Version: 
Flash Version: Shockwave Flash 22.0 r0

Both keys on Japanese Mac keyboard and Japanese PC keyboard has a key labeled "英数" (called "Eisu-key"). However, they are really different. Mac's 英数 key is to switch keyboard layout to ASCII capable keyboard layout. PC's 英数 key is to enter alphanumeric character input mode of IME. And Mac's key is "Lang2" key but PC's key is "CapsLock" key physically.