1668061 - Element doesn't receive click event if the body has negative z-index

Status: NEW

(Core :: Web Painting, defect, P3)

Description

[Ksenia Berezina [:ksenia]]

Attachment: 58082.html

This was initially reported in https://github.com/webcompat/web-bugs/issues/58082

Steps to reproduce:

1. Open https://www.tretti.se/ in Firefox on mobile
2. Wait for the cookie modal window to show up
3. Click on "Acceptera alla" button to accept cookies

Expected:
Window closes

Actual:
Window stays open

I've attached a reduced test case, which is also reproducible on desktop.

The behavior seems to be caused by the body element having negative z-index. In Firefox the targeted div is not hit-testable, however text inside it can be selected with drag-select. In Chrome the element is hit-testable and receives the click event.

Comment 1

[Kartikaya Gupta (email:[e-mail])]

I'm able to reproduce in desktop with the attached test case. This seems like a fairly fundamental hit-testing difference between Chrome and FF, not specific to APZ. Moving to Web Painting since that's where display-list hit-testing happens.

Comment 2

[Miko Mynttinen]

Spec issue, marking this as lower priority.