1327274 - Shift+Tab doesn't change focus after navigation if there's no focusable elements on the page

Status: NEW

(Core :: DOM: UI Events & Focus Handling, defect, P3)

Description

[arni2033]

>>>   My Info:   Win7_64, Nightly 49, 32bit, ID 20160526082509
STR_1:
1. Copy this url to clipboard:   data:text/html,<style>body{height:10000px;width:10000px}
2. Open new tab, paste url from Step 1 to urlbar, press Enter
3. Press Shift+Tab several times

AR:  No visible action
ER:  Focus should be put to searchbar, then to urlbar, then to identity block, etc

Note:  Happens if there's no focusable elements on the page, e.g. only <canvas> with WebGl is present

Comment 1

[Emil Pasca [:emilpasca]]

User Agent:  Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:53.0) Gecko/20100101 Firefox/53.0

I have tested this issue on Windows 10 x64 with the latest Firefox release (50.1.0) and the latest Nightly (53.0a1-20170108030212) and managed to reproduce it as described in STR_1 in the description.

Comment 2

[James Teh [:Jamie]]

This also impacts the new print modal. If you shift+tab to print preview before the preview is initialised (i.e. while it is just a blank document), you won't be able to shift+tab any further. I discovered this while working on bug 1660363. I haven't been able to reproduce this in manual testing, but it was showing up intermittently in automation.