Just want to make sure... The "Expected Result" is not what we want right? The arrow key should focus on the tile and then navigate the tile instead of just scroll up and down the scrollbar.

Please see the screencast for what I have now. wdyt?

https://screencast.googleplex.com/cast/NTM4MjY0MzkzMTY3NjY3MnwxMTIwOGY4NS1iNA

Hey Weilun: that's right, the existing behavior that we have on Canary now just with the jumping/flickering fixed would be what we want.

Talking offline with Weilun, there's a bit of concern that this will break other aspects of the navigation. We'll revisit this later in the M71 timeframe, but focusing on other bugs first.

Sorry, later in the M70 timeframe :)

The screencast actually looks ok to me - does voiceover still read the group, and then the individual title collections?

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/cdfd0835f3bb7598748a5eff0b1ec368b64f0eb1

commit cdfd0835f3bb7598748a5eff0b1ec368b64f0eb1
Author: Weilun Shi <sweilun@chromium.org>
Date: Fri Aug 24 18:37:57 2018

[NTP] Fix flickering issue on custom background dialog

This CL modify a few event listener, using keydown event instead of
keyup event making the arrow key interaction between tiles will not
propagate to the menu. With this CL, when hitting arrow key on the tile
will not move the scroll unless it has to eg. the next focus item located
outside the current viewpoint.

Screencast:
https://screencast.googleplex.com/cast/NDgzNTA4MjMwOTIwNjAxNnw5NjFlYmFkZC0zNA

Bug:  872601 
Change-Id: I352a28dbc0a05779818ee27fd9df563114caf6c2
Reviewed-on: https://chromium-review.googlesource.com/1187236
Reviewed-by: Kristi Park <kristipark@chromium.org>
Commit-Queue: Weilun Shi <sweilun@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585917}
[modify] https://crrev.com/cdfd0835f3bb7598748a5eff0b1ec368b64f0eb1/chrome/browser/resources/local_ntp/custom_backgrounds.js

This CL will not change the current behavior for screen readers. Now, when you press the arrow key, it will quick scan through the tiles in that direction instead of only making one change when you release the the arrow key.

Update:

Rechecked the above issue on Win(7,8,8.1,10) ,Mac(10.12.6 , 10.13.1 , 10.13.6, 10.14)  and Linux(14.04 LTS)  OS using latest canary build #70.0.3534.0 and issue is fix. Flickering of contents is not seen on pressing down arrow key.

Please find attached screencast for reference.

Thank You...

Deleted: Canary Behaviour.mp4 531 KB

	Canary Behaviour.mp4 531 KB View Download