A good start, I think, would be a UseCounter that is ticked when we show a datepicker pop-up on Android for a synthesized click() on the input element. It may also be useful to just add an OS-agnostic UseCounter, as long as we can filter the results by OS. (It would actually be very useful to know how many sites are synthesizing click()s for type=date on desktop Chrome, because that does nothing today!).

Dave - is this bug appropriate for someone from your team to tackle?

Additional note: as per https://github.com/whatwg/html/issues/3232#issuecomment-345337810, Chrome also shows a UI for synthesized clicks() on type=file, for both Desktop and Android. We should add a UseCounter for that too.

Assigning to dtapuska@ to determine if his team is a good fit for doing this investigation.

Ping; Dave, any chance of deciding if this is a good fit for your team (maybe a small Q1 OKR?)

This probably should be done by the forms team which owns the input fields.

tkent@ WDYT?

+ keishi@ as it appears it is a few more weeks until tkent@ is back.

tkent@ - I'm not clear why you un-cc'd a bunch of people here (including yourself) without comment? Dave and I are trying to determine who the correct owner for this data collection would be.

smcgruer@, HTML/Forms team is responsible for <input type=date> implementation and specification. The team will handle this, probably before the next branch.

I found this issue affected type=color on desktop too.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b503c09e39356e507c0e6348fad89bc5c10ace9e

commit b503c09e39356e507c0e6348fad89bc5c10ace9e
Author: Kent Tamura <tkent@chromium.org>
Date: Thu Jan 11 05:34:11 2018

Add UseCounters for color/temporal choosers opened by trusted/untrusted events.

Bug:  786480 
Change-Id: I7f891b11174ba5d38dec11d72cc85fe7775fad41
Reviewed-on: https://chromium-review.googlesource.com/861373
Reviewed-by: Keishi Hattori <keishi@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#528567}
[modify] https://crrev.com/b503c09e39356e507c0e6348fad89bc5c10ace9e/third_party/WebKit/Source/core/html/forms/ChooserOnlyTemporalInputTypeView.cpp
[modify] https://crrev.com/b503c09e39356e507c0e6348fad89bc5c10ace9e/third_party/WebKit/Source/core/html/forms/ColorInputType.cpp
[modify] https://crrev.com/b503c09e39356e507c0e6348fad89bc5c10ace9e/third_party/WebKit/Source/core/html/forms/MultipleFieldsTemporalInputTypeView.cpp
[modify] https://crrev.com/b503c09e39356e507c0e6348fad89bc5c10ace9e/third_party/WebKit/Source/core/html/forms/MultipleFieldsTemporalInputTypeView.h
[modify] https://crrev.com/b503c09e39356e507c0e6348fad89bc5c10ace9e/third_party/WebKit/public/platform/web_feature.mojom
[modify] https://crrev.com/b503c09e39356e507c0e6348fad89bc5c10ace9e/tools/metrics/histograms/enums.xml

This is awesome! Thank you very much for adding the UseCounters so quickly tkent@ :)

I linked to the resulting use counter data here:
https://github.com/whatwg/html/issues/3232#issuecomment-371183100

Commented on https://github.com/whatwg/html/issues/3232#issuecomment-371184702 that I think that this should be fixed in Firefox.

The NextAction date has arrived: 2018-03-20