1949678 - Keyboard focus trapped on Shift+Tab when a popover is open

Status: RESOLVED FIXED

(Core :: DOM: Core & HTML, defect, P3)

Description

[@CSSence]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:134.0) Gecko/20100101 Firefox/134.0

Steps to reproduce:

In Firefox (at least on Windows&Linux),
go to https://codepen.io/cssence/pen/RNwarvQ
click the "1 - Toggle Popover" button
press Shift+Tab repeatedly.

Actual results:

Keyboard focus is trapped in a loop, read
https://cssence.com/2025/popover-shift-tab-issue/
for more details.

Expected results:

There should be no limit to which interactive elements can be accessed, normal backwards moving behavior (same as e.g. in Chromium) should occur.

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::DOM: Core & HTML' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 2

[Henri Sivonen (:hsivonen)]

asurkov, can you, please, take a look?

Comment 3

[@CSSence]

I now have confirmation that the issue also occurs on Firefox for MacOS.

Comment 4

[BugBot [:suhaib / :marco/ :calixte]]

Redirect a needinfo that is pending on an inactive user to the triage owner.
:edgar, since the bug has recent activity, could you have a look please?

For more information, please visit BugBot documentation.

Comment 5

[Edgar Chen [:edgar]]

Attachment: Bug 1949678 - Need to check tabindex when handling sequential focus handling for popovers;

Comment 6

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/8c2fc1b0de47
Need to check tabindex when handling sequential focus handling for popovers; r=smaug

Comment 7

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Created web-platform-tests PR https://github.com/web-platform-tests/wpt/pull/51659 for changes under testing/web-platform/tests

Comment 8

[Iulian Moraru]

https://hg.mozilla.org/mozilla-central/rev/8c2fc1b0de47

Comment 9

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Upstream PR merged by moz-wptsync-bot