Bing tab index - selects hidden dropdown menus




Last year
5 months ago


(Reporter: cfogel, Unassigned)



Firefox Tracking Flags

(firefox59 affected, firefox60 affected, firefox61 affected)



(1 attachment)

Posted image bing-tab_index.gif
[Affected versions]:
- Firefox 60.0, Firefox 60.0b15, Firefox 61.0a1 (2018-05-01)

[Affected platforms]:
- Windows 10x64, Ubuntu 16.04x64   

[Steps to reproduce]:
1. Launch Firefox.
2. Go to
3. Select the [] link from the header section.
4. Press the TAB key 3 times.

[Expected result]:
- The active element should be the left pointing arrow from the bottom-right section of the page.

[Actual result]:
- The preferences list selection is displayed. The list is empty so you see a dashed line, 2px in height. See the attached screen-cast.
[Regression range]:
Not a regression, since it's reproducible on Firefox 4.0b9pre. Earlier versions do not display the website's affected section properly.

[Additional notes]:
- The issue is also reproducible if instead of steps 3+4 you press the TAB key 10 times.
- The list should be skipped since it's not displayed, as default.
- The issue is not reproducible on other browsers.
- Issue is not present on macOS 10.12.6.
The element is #id_hbfo, and its HTML for me is:
> <span id="id_hbfo" _iid="SERP.5068" class=" hpfo hb_hpqexp  slide_up" aria-hidden="true" aria-haspopup="true" role="menu">

It's not clear to me why this element is focusable at the first place...

Anyway, it sounds like a problem related to the focus manager, so move to DOM.
Component: Layout → DOM
Priority: -- → P3
Component: DOM → DOM: Core & HTML
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