Reported on Chrome 54.

Product forums thread: https://productforums.google.com/forum/?utm_medium=email&utm_source=best_answer_notification_button#!topic/chrome/snTSPmcwIjs;context-place=forum/chrome

From what I've seen, the issue only seems to effect custom themes. Can anyone confirm this?

I can confirm that this seems to be limited to custom themes, reseting to default theme seems to solve the problem.

Is this still an issue? If so I can ping someone to get this resolved faster.

Yes, this is still an issue. I have a custom theme and all video players I fullscreen have that odd border on left and top edges.

Wanted to elaborate on this a bit: This bug only happens on screens that do not have an active/unhidden taskbar. Enabling taskbars on all monitors removes that border, but if you only have one on your second monitor for example, your first monitor will always get those borders on fullscreen videos.

I'll flag this now. Hold on guys!

I too am having these issues and would appreciate not having to hot fix it by removing my theme and/or putting my taskbar on my 2nd monitor. 

Please fix this google. 

Sorry everyone, I'm really trying to get someone's attention on this issue. It's been months since this was announced so give me a week to see if I can get someone to confirm it.

+Pangu - can you help take a look at this?

Interestingly, I can get rid of the border by:

1. Having a fullscreen window open on my secondary monitor (Netflix, playing fullscreen video).
2. Coming out of fullscreen mode.
3. Dragging the window to my primary monitor, then going fullscreen on there (no border appears).
4. Coming out of fullscreen mode again.
5. Dragging the window back to my secondary monitor, going fullscreen again.
6. Border is no longer present.

Also:

> Wanted to elaborate on this a bit: This bug only happens on screens that do not have an active/unhidden taskbar. Enabling taskbars on all monitors removes that border, but if you only have one on your second monitor for example, your first monitor will always get those borders on fullscreen videos.

This happens on my secondary monitor, which has an active/hidden taskbar.

I've had this bug a long time, any update on a fix? Is this being worked on?

This issue is also occurring for me for the past year. When are you guys going to fix this. I'm tempted to go over to Firefox until this is fixed. Its kind of a big nuisance for me.

It feels like part of the Windows Chrome's full screen code is assuming the awful Windows 10 default layout of a useless taskbar on every screen, so when you happen to have anything else like not having pointless taskbars on every screen or not using Windows 10 at all, it sizes and positions the full screen image incorrectly.

You can do the "change Windows theme to something else and back" trick for a one-or-so time workaround.

I found that a fix for me is to not have Chrome in full screen.

Conditions for bug to appear:
-Dual monitor
-OS: Windows
-if Win10 have taskbar disabled (in other words "Show taskbar on all displays: off") at monitor where you try to use fullscreen in Chrome
-Have custom theme installed in Chrome
-Chrome should be maximized

When you try to turn Chrome into fullscreen mode (either F11, or fullscreen in youtube, vimeo etc.) there appears to be 2 stripes of desktop seen on the left and top side.

Ways to "fix":
-click on the desktop in other monitor when Chrome is in fullscreen mode (sometimes you have to click other monitor's desktop then click video in fullscreen and again click other desktop)
-before turning on fullscreen mode Restore Down Chrome and when going into fullscreen mode bug won't appear
-remove custom theme
-turn on "Show taskbar on all displays" in Win10
-Open new Chrome window

I can verify everything stated in Comment #17 is exactly the same for me on Chrome 59 and Chrome Canary 61, still.

I'm not sure if there are any more details to add than theirs, but whatever it takes to get this nearly year-old bug fixed I would be glad to provide for whoever needs it.

Any chance of any semblance of an update regarding this issue? This is swiftly becoming a deal-breaker for me in terms of my browser choice. 

Are you using a theme? Using the default Chrome theme or finding another theme fixed this issue for me. Most themes seem to cause this issue though so it's quite difficult to find one that works.

That's not a fix. It's not using a feature if the browser to avoid a bug.

Another quick-fix is pressing Win+D (show/hide desktop) twice. Hope it helps someone.

The simplest fix for users who want to keep their custom themes and not enable taskbars on secondary displays is to simply NOT have your Chrome window maximized before pressing 'fullscreen.'

Just tried it, it is not fixed.

Dark theme V3.
https://chrome.google.com/webstore/detail/dark-theme-v3/djlgdeklopcjagknhlchbdjekgpgenad


Chrome Version 61.0.3163.71 (Official Build) beta (64-bit)

my bad...it appears to be fixed on both my 4K monitors but not on my 1080p...weird

https://www.youtube.com/watch?v=-c7D5YHSTwk&feature=youtu.be 4K external

https://www.youtube.com/watch?v=DbZXf_YwoVg&feature=youtu.be 1080p external

EDIT: after messing with the scale option under display settings in windows, it appears that the reason for it being fixed on my 4K monitors was that I have windows/text/etc scaled to 200% instead of the standard 100% ...so nevermind, google hasn't done anything :(