1821282 - event.buttons is 0 for pointerleave event that leaves browser window too fast

Status: UNCONFIRMED

(Core :: DOM: UI Events & Focus Handling, defect)

Description

[musodojomail]

User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/110.0

Steps to reproduce:

In up-to-date Ubuntu with repeated tests event.buttons = 0 rather than expected event.buttons = 1 (for left mouse down)

Actual results:

For elements at the very edge of the browser window, a pointerleave event with pointer down engaged (e.g. left mouse button) event.buttons = 0 when the pointer leaves the browser at high speed (slow speed works).

Tested in Firefox Developer Edition 108.0b3 (64-bit): event.buttons = 0
Tested in Firefox Browser 110.0.1 (64-bit): event.buttons = 0
Tested on Chromium 110.0.5481.177 snap (64-bit): event.buttons = 1

Expected results:

a pointerleave event with pointer down engaged (e.g. left mouse button) should report event.buttons = 1 (for left mouse down)

Comment 1

[Gregory Pappas [:gregp]]

Please attach a reduced test case (.html file) which reproduces the issue.

Comment 2

[musodojomail]

Attachment: simple recreation of pointerleave event.buttons error

Comment 3

[Hsin-Yi Tsai (she/her)[:hsinyi]]

Per offline discussion, downgrading to S3, given that the reproducible situation is restrictive.