After looking in to what the proper event is, it seems that left/right scrolling is also failing to trigger the wheel event.

Unable to reproduce the issue on Win-10 using chrome latest stable #67.0.3396.87 and latest canary #69.0.3457.2.

Attached a screen cast for reference.

Following are the steps followed to reproduce the issue.
------------
1. Opened up the test case "scroll_test.html".
2. Scrolled left/right using both two-finger scroll on a track pad and mouse scroll.
3. Observed that no keydown events are generated as expected.

natedogith1@ - Could you please check the issue on latest stable #67.0.3396.87 by creating a new profile without any apps and extensions and please let us know if the issue still persist or not.

Thanks...!!

Deleted: 851306.mp4 1.3 MB

	851306.mp4 1.3 MB View Download

Which other browser (and version) exhibits a different behavior?

Just tried on

Google Chrome	67.0.3396.87 (Official Build) (64-bit) (cohort: 67_win_87)
Revision	878cd31214ac27a3996927cd5c9c138b10c9fc8d-refs/branch-heads/3396@{#771}

and

Google Chrome	69.0.3460.0 (Official Build) canary (64-bit) (cohort: Clang-64)
Revision	135d57dc629412377f2755d8aea41dd14278b8b6-refs/branch-heads/3460@{#1}

with guest/blank profiles and the issue still exists.

This doesn't occur on Firefox 60.0.2 (64-bit), Microsoft Edge 41.16299.402.0, or Internet Explorer 11.431.16299.0

Thank you for providing more feedback. Adding the requester to the cc list.

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

#5 - it does not happen for me (HP ProBook 4340s using Synaptics Pointing Device software, version 19.0.19.65).
Can you provide some more information about your track pad?
This issue is probably specific to certain track pads, or track pad applications/drivers that send different signals that other browsers already know to handle them properly.

As per comment #7, adding the Needs-Feedback label.

Thanks...!!

I'm on a Dell Precision M3800.
The touchpad is named "Dell Touchpad", the Driver Provider is Synaptics, and the Driver Version is 19.2.17.64

Thank you for providing more feedback. Adding the requester to the cc list.

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

Chao, can you please see if you can repro this on your Windows laptop? I suspect it's an issue with the driver but it's surprising it works correctly in other browsers.

Tested M67 and M69 on Surface 2 pro and Dell XPS13 with mouse or touchpad.
Can not reproduce.

natedogith1@, please capture and attach here a trace using these instructions: https://www.chromium.org/developers/how-tos/submitting-a-performance-bug

Here's the capture.

Deleted: trace_Mon_Jun_18_2018_6.04.48_PM.json.gz 1.1 MB

trace_Mon_Jun_18_2018_6.04.48_PM.json.gz 1.1 MB Download

Thanks. Trace shows that Chrome is getting keyboard events from the OS. If this works in other browsers there must be some kind of application specific config/issue in the driver. Unfortunately there's not much we can do here from Chrome's side.