User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0 Build ID: 20180424100107 [Affected versions]: Nightly 61.0a1 [Affected Platforms]: All [Prerequisites]: Accessibility tab is opened and enabled [Steps to reproduce]: 1.Click the "document" item from the "Role" panel. 2.Select the first line without a dropdown arrow 3.Press the "Left arrow" key and observe what happens next. [Expected result]: -The "document" parent row should be selected Please see Comment 1 from bug 1439630 [Actual result]: -Nothing happens, the "Left arrow" key is not used to navigate through lines. Note that in the Inspector Tab/Properties panel for example, pressing the "Left arrow" key on a child row without dropdown arrow, moves the selected row back to the parent and pressing again the "Left arrow" key closes the child row.

Please note that the issue is also occurring when using the "Right arrow" key.

(In reply to Cristian Craciun from comment #1) > Please note that the issue is also occurring when using the "Right arrow" > key. Right arrow navigate to next node is not desired and is confusing to a11y users. We disable it by default in the VirtualizedTree component.

Comment on attachment 8981233 [details] [diff] [review] 1456756 patch Review of attachment 8981233 [details] [diff] [review]: ----------------------------------------------------------------- Thanks for the patch! R+, assuming try is green. Honza

Pushed by yura.zenevich@gmail.com: https://hg.mozilla.org/integration/mozilla-inbound/rev/fc76999d8ee0 select parent row if available when ArrowLeft is pressed on collapsed or non-expandable row. r=Honza

Carry over

Comment on attachment 8982209 [details] [diff] [review] 1456756 updated patch [Feature/Bug causing the regression]: Not a regression, supports a11y inspector deliverable for Fx61 [User impact if declined]: Users won't be able to use keyboard to jump to parent accessible object in accessibility tree when pressing ArrowLeft. [Is this code covered by automated tests?]: No [Has the fix been verified in Nightly?]: Yes [Needs manual test from QE? If yes, steps to reproduce]: Same STR as in description. [List of other uplifts needed for the feature/fix]: N/A [Is the change risky?]: No [Why is the change risky/not risky?]: Just improves keyboard navigation, when pressing left arrow within TreeView [String changes made/needed]: None

Comment on attachment 8982209 [details] [diff] [review] 1456756 updated patch a11y inspector improvement. Approved for 61.0b11.

Hi Everyone , i managed to reproduce this issue using the 61.0a1 (2018-05-01) version of Nightly but i can no longer reproduce this issue on the later versions of it. I will mark this issue accordingly.