The tooltips I've seen this for show up upon clicking, just not hovering when they are expected to show. 

First screenshot shows the problematic behavior. Second screenshot is after clicking (or alternatively shows the correct behavior upon hovering).

Have checked on Canary 62.0.3184.0 and see the same behavior.

Able to reproduce this issue on Windows-10 using chrome latest stable #60.0.3112.90 by following steps mentioned in the original comment. Observed no tool tip while hovering on note.

abwickes@ Could you please confirm on which version of M-59 it used to work before? I have tested this issue on chrome M59-59.0.3030.0 and able to reproduce this issue.

Note: This issue is not observed on Mac and Linux OS.

I don't know the exact version when it worked, it may be even before 59. 

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

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

Please bisect.

Dave, any recent hover changes?

Seems to be working for me on Chrome 60.0.3112.90 on Windows 10.

What type of mouse is being used?

abwickes@ - Thanks for the update.

Retried the issue on Ubuntu 14.04, Windows 7,8.1,10 Desktop and Mac OS 10.12.6 using latest Stable 60.0.3112.101, canary 62.0.3187.0 and also checked on older version 45.0.4254.103 unable to reproduce the issue. 

Able to reproduce the issue on Windows 10 laptop Dell precision M3800 HiDpi. Issue is observed on older version of chrome #45.0.4254.103 as well.

Reporter@ Please update the thread with the system configuration details on which you can see the issue for further investigation.

Thanks.

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This is a problem with the wikipedia site. It specifically checks if the user agent has a touchscreen or not and will bind the click event as opposed to the hover event listener.

#10: I am running on a desktop PC with regular mouse and keyboard setup, no HiDPI (1080p), no touchscreen or similar peripherals, Windows 8.1 Pro 64-bit. 

#11: As I said, no touchscreen and I see the problem on a private page as well. How can I check for this behavior on the private page? 

You can check the site via an Incognito Window.

The relevant code is: https://en.wikipedia.org/wiki/MediaWiki:Gadget-ReferenceTooltips.js

I'm not sure how isTouchscreen works where it gets that information. You might want to contact wikipedia.

From the linked code:

mw.messages.set( {
	// omitted
	"RT-settings" :"Tooltip settings"
} );
var settings = document.cookie.split("RTsettings=")[1];
settings = settings ? settings.split(";")[0].split("%7C") : [1, 200, +("ontouchstart" in document.documentElement)];
var isTouchscreen = +settings[2];

I am not convinced that this is not an issue with Chrome, but admittedly am also not a web developer. 

Would appreciate feedback from brajkumar@chromium.org and susanjuniab@chromium.org