Tested on windows 7 , 10 & 8.1 , mac os 10.12.2 , ubuntu 14.04 using latest chrome  stable M57 #57.0.2987.98 and chrome canary M59 #59.0.3041.0 and issue is reproduced.

Attached screencast for reference.

Issue is seen from M40 #40.0.2172.0 and is a non-regression issue.

Marking it as untraiged for further inputs on this.

Thanks!

Deleted: 701530.mp4 2.7 MB

	701530.mp4 2.7 MB View Download

Here's a copy from the instruction in the linked jsfiddle:

1 First select the text in input element[1].
2 Then click the button[3] below the "box" (which is an iframe). The click handler transfers focus programatically to button in iFrame[2].
3 Press space bar or enter key to trigger click handler for the button in the iFrame[2].
4 Note that the target element for the keydown event captured at document level is BUTTON[2].
5 This confirms the focus is actually on the button.
6 However, Issue #1: The text in the input element[1] is selected with a blue background not gray.
7 Type a letter.  Issue #2 : Notice that it appeared appear in the input element[1]!
8 Also notice that the blue focus highlighting on the button is now gone but...
9 The target element for the keydown event is still BUTTON[2]!
10 Type another letter. It also appears in the input element but now the target element for the keydown event is (correctly) the input element[1].
11 Pressing space bar / enter key no longer triggers the button[2] click confirming it no longer has focus.

There are 2 issues reported in this (in item 6 and 7).

- Issue #1: The text in the input element[1] is selected with a blue background not gray.
-  Issue #2 : Notice that it appeared in the input element[1]

I tried M57 on Linux, and confirmed #1, but not #2.
The video on comment #2 seems only tested #1.

On windows with M56, I could reproduce #2.
I retried with M57 and #2 was not reproducible.

From these above I conclude #1 is the only problem and #2 was fixed during
M57 development.  kang...@, if you could confirm the  issue #2  is fixed
once you get your Chrome updated to M57, it's much appreciated.

Thanks for the report!

Confirmed  issue #2  is fixed with M57.
Thank you!

This issue has been Available for over a year. If it's no longer important or seems unlikely to be fixed, please consider closing it out. If it is important, please re-triage the issue.

Sorry for the inconvenience if the bug really should have been left as Available.

For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot

Mark fixed per #c4 and confirmed with M69.