STR:

1. Load the data:text/html,<style> div div { overflow: hidden; font-family: monospace; width: 2ch; } </style><div style="display: flex; flex-direction: row-reverse;"><div>abcde</div><div>fghij</div> with CtW on
2. Hit test "fg"

Expected: We receive "fg" as a hittest result
Actual: Hit testing reports the entire acc, including the hidden portions (fghij)

3. Hit test "ab"

Expected: we get "ab"
Actual: we get the "fg" node

(In reply to Morgan Reschenberg [:morgan] from comment #0)

Actual: Hit testing reports the entire acc, including the hidden portions (fghij)

I don't quite get this bit. Hit testing for the acc (ChildAtPoint) reports the "fghij"text Accessible, which makes sense; we can't get any smaller than that. The client then has to call OffsetAtPoint with the point in question to determine which character it's interested in.

However, hit testing h, i or j with ChildAtPoint shouldn't report the fg Accessible.

Depends on D175193

Depends on D175194

Depends on D175195

Backed out for causing multiple mochitest failures.

• Push with failures

• Failure log for ba jobs

• Failure log for a11y jobs

• Backout link

https://treeherder.mozilla.org/jobs?repo=try&revision=fe498bfa3970e7475e2fa878047a0375137b3521

Backed out for causing mochitests failures in accessible/tests.

• Backout link
• Push with failures

• Failure Log - ba
• Failure line: TEST-UNEXPECTED-FAIL | accessible/tests/browser/tree/browser_general.js | Test timed out -

• Failure Log - a11y
• Failure line: TEST-UNEXPECTED-FAIL | accessible/tests/mochitest/actions/test_media.html | Scenario #0 of test with ID = 'name change handling' failed. 'name changed event is missed.

https://treeherder.mozilla.org/jobs?repo=try&revision=d788d50e0f042959444b7e97f5dbcd416c31cbdc

Backed out with Bug 1828373 and Bug 1825411 for accessible failures on on /browser_general.js

• backout: https://hg.mozilla.org/integration/autoland/rev/8d8d99e7581851de698e27339dffd60ee8dc8e32
• push: https://treeherder.mozilla.org/jobs?repo=autoland&group_state=expanded&revision=fa9772a45927f265c2eb2fa7301061c3406441f9
• failure log: https://treeherder.mozilla.org/logviewer?job_id=414559862&repo=autoland&lineNumber=4569

[task 2023-05-03T23:03:41.235Z] 23:03:41     INFO - TEST-PASS | accessible/tests/browser/tree/browser_general.js | Wrong last child of [role: text leaf, name: 'hello world', address: [xpconnect wrapped nsIAccessible]] - 
[task 2023-05-03T23:03:41.236Z] 23:03:41     INFO - Adding overflow:hidden styling to div
[task 2023-05-03T23:03:41.236Z] 23:03:41     INFO - Buffered messages finished
[task 2023-05-03T23:03:41.237Z] 23:03:41     INFO - TEST-UNEXPECTED-FAIL | accessible/tests/browser/tree/browser_general.js | Test timed out - 
[task 2023-05-03T23:03:41.455Z] 23:03:41     INFO - GECKO(5468) | MEMORY STAT | vsize 2104178MB | vsizeMaxContiguous 66514862MB | residentFast 236MB | heapAllocated 91MB
[task 2023-05-03T23:03:41.459Z] 23:03:41     INFO - TEST-OK | accessible/tests/browser/tree/browser_general.js | took 46426ms

Backout merged to central: https://hg.mozilla.org/mozilla-central/rev/8d8d99e75818

https://hg.mozilla.org/mozilla-central/rev/69b67a4f7465
https://hg.mozilla.org/mozilla-central/rev/f008e16e684c
https://hg.mozilla.org/mozilla-central/rev/a819a38858ad
https://hg.mozilla.org/mozilla-central/rev/29d02d013170

The patch landed in nightly and beta is affected.
:morgan, is this bug important enough to require an uplift?

• If yes, please nominate the patch for beta approval.Also, don't forget to request an uplift for the patches in the regressions caused by this fix.
• If no, please set status-firefox114 to wontfix.

For more information, please visit BugBot documentation.

backed out in 115 beta (115.0rc1) for causing bug 1840200 (backout patch is in bug 1840200)

I was able to reproduce the issue on Mac 12.6 using FF build 115.0, using below steps:

1. Enable VoiceOver, In VoiceOver Utility.app > Navigation ensure "Synchronise VO focus and mouse cursor" is checked
2. Load the provided test case
3. Mouseover "fg" with VoiceOver enabled
   Expected:
   VO reports "fg" only
   Actual:
   VO reports all on-screen text.

Verified that issue is fixed on Mac 12.6 using FF build 116.0a1(20230627214548).