Chrome Version: 64.0.3256.0/10093.0.0 dev channel Peppy,Kip and Paine
OS: Chrome

What steps will reproduce the problem?
(1)In sign-out screen click on three dot Menu to 'Add supervised User'
(2)In 'Create Supervised User' overlay create Supervised user with lengthy name(For Example : hjklsbhfyueonhnfdnhfjekjenkejrelkrenmekmgtekfhfhtht) 
(3)Now in sign-out screen observe Supervised user with name 'hjklsbhfyueonhnfdnhf.........' -> Now hover mouse on lengthy name 
and observe for Tool tip  (Please refer Video)

Note:  In sign-out screen click on drop down of Supervised user which has lengthy name -> now  hover mouse on name('hjklsbhfyueonhnfdnhf.........') available at 'remove this user' option and observe for Tool tip 

Expected: Tool tip should be seen on hovering mouse at Supervised user which has lengthy name('hjklsbhfyueonhnfdnhf.........')
Actual: Instead Tool tip is seen missing 

This is Non-Regression Issue seen from M-55

@wzang: Please confirm the issue
 

Deleted: Actual_NoTooltip.mp4 18.2 MB

Actual_NoTooltip.mp4 18.2 MB Download

Deleted: Actual_NoTooltip.jpg 389 KB

	Actual_NoTooltip.jpg 389 KB View Download