ballajustin@ Thanks for the issue.

Tested this issue on Windows 7,10 and Mac OS 10.12.6 using the latest Canary 64.0.3250.0 and Stable 62.0.3202.62 and unable to reproduce this issue by following the below steps.

1. Launched Chrome and opened a new tab.
2. Entered 'you' in the omnibox and window is not entered into fullscreen.
Attached is the screen cast for reference.

Request you to please retry the issue on a new Chrome profile without any flags/extensions and update the thread with the observations.

Thanks..

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I have reset chrome to default. On your same version. Ensured all extensions were disabled. Problem still there. 

Thank you for providing more feedback. Adding requester "susanjuniab@chromium.org" to the cc list and removing "Needs-Feedback" label.

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** I have just tested out the bug with a different keyboard plugged into my laptop. Problem does not recreate with new keyboard, still present with laptop keyboard. 

No clue as to why it only occurs on the laptop, I will try to do some research and I have include a video recording as you did showing regular keyboard vs laptop keyboard. (Sorry if you don't have a program to open it)

Thank you for your response also. :)

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2017-10-27 19-17-22.flv 13.5 MB Download

Thanks for comfirming the issue as fixed on adding external Keyboard.

Could you please check the issue on other browser by inputing through Laptop Keyboard and let us know the behaviour.

Thanks!

Sorry for the extremely, extremely late reply. But the bug is not reproducible on other browsers. 

Thank you for providing more feedback. Adding requester "sc00335628@techmahindra.com" to the cc list and removing "Needs-Feedback" label.

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This is probably best thought about by someone who worries about keyboard shortcuts.  Adding appropriate components.  Maybe this is similar to or can be mis-interpreted by some computers as a different shortcut?

Hey ballajustin: Can you go to this example textarea and try pressing "y" "o" and "u" simultaneously? 

https://developer.mozilla.org/en-US/docs/Web/HTML/Element/textarea#Example

I'm trying to figure out if it happens everywhere in Chrome or just in the Omnibox.

My suspicion is that it's a hardware quirk and the simultaneous keypresses are translated to an F11 key.

Fullscreen is still entered in when i press "y" "o" and "u" simultaneously
in that text area.
It is no longer a problem with me as I rarely use the laptop keyboard.
If you would like to close the thread that is fine, but if you would really
like to solve this problem, I will assist as best as possible.
If it is really a hardware "quirk" there is nothing we can do anyways.

Regards.

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Thanks ballajustin@!

Since you are still entering fullscreen when pressing "y" "o" "u" outside of the Omnibox, AND it's specific to that laptop keyboard, I'd suggest two things:

1. It's not specific to Omnibox.
2. It's probably a hardware quirk.

I will be closing this bug as Wontfix. Thanks for doing that above test for me.