Steps to reproduce the problem:
1. Some apps enable Accessibility service
2. Some JS/CSS events are not notified on following situations.

Case A) onmouseover (JavaScript) is not notified while the mouse pointer is put on the object.
Case B) :focus and :hover (CSS) don't work. The code is as follows.
a:focus, a:hover {
    border: 3px solid #F00 !Important;
    margin:-3px !Important;
}

※Everything works well when Accessibility service is disabled.

What is the expected behavior?

What went wrong?
Some JS/CSS events are not notified when some apps enable Accessibility service.

Did this work before? N/A 

Does this work in other browsers? No
 This issue also happen in all apps using WebView.
And it also happen in Android Chrome.
But it does not happen in Firefox Browser.

Chrome version: 54.0.2840.85  Channel: stable
OS Version: 6.0.1
Flash Version: