2003944 - [meta] Proposed Interop-2026 focus area for "pointer events for mobile"

Status: NEW

(Core :: Panning and Zooming, task)

Description

[Daniel Holbert [:dholbert]]

Filing a bug to cover the work described in this interop-2026 proposed focus-area:
https://github.com/web-platform-tests/interop/issues/1123

This was a proposal from Mozilla's DOM team, but we anticipate that this includes a mix of DOM work and APZ work (and maybe wpt harness work? see below...)

Test links:
https://wpt.fyi/results/pointerevents?label=master&label=experimental&aligned&q=touch
https://wpt.fyi/results/touch-events?label=master&label=experimental&aligned&q=touch

I haven't looked through all the test failures in detail, but I'm noticing that there might be some WPT-harness work involved here too... Some of the WPTs (e.g. the various pointerevent_touch-action- tests) use a helper-function called touchScrollInTarget to synthesize a touch action, and most of those tests seem to have timeouts or other sorts of failures in Firefox right now, which I suspect are a sign of some missing harness-related feature. I wonder how much effort is involved in getting that to work properly. (Searching bugzilla for that function name, I found bug 1773393 comment 24 and bug 1797215 comment 0, which sound like that's known to not-currently-work [as of those comments at least] and there's probably some moderate effort involved to get it working.)

Comment 1

[Daniel Holbert [:dholbert]]

botond and/or dlrobertson, could you come up with a size-estimate for the APZ work here? (for touchScrollInTarget and anything else that jumps out as nontrivial from the list of failing tests)

(smaug mentioned in slack that it doesn't look too bad from a DOM point of view; I wonder if there's more APZ/webdriver-ish work required though.)

Comment 2

[Olli Pettay [:smaug][[e-mail]]]

I was thinking the new touch-action values being the biggest thing for APZ
https://www.w3.org/TR/pointerevents3/#the-touch-action-css-property is the old
https://w3c.github.io/pointerevents/#the-touch-action-css-property is the new