UserAgent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36

Steps to reproduce the problem:
1. Open a glitchy site that hammers user with msgboxes
2. Use mouse to check "Prevent this page from creating additional dialogs"
3: Go back to your real work on your keyboard

What is the expected behavior?
Underlined keyboard shortcut to make the check box accessible via a keyboard. ALT+P or whatever.

What went wrong?
KB accessibility broken - Mouse or other pointer interaction required to continue.

Did this work before? No 

Chrome version: 49.0.2623.112  Channel: n/a
OS Version: 6.1 (Windows 7, Windows Server 2008 R2)
Flash Version: Shockwave Flash 21.0 r0

Accessibility issue. (Missing accelerator keys / underline keyboard shortcuts / access keys.)