Same issue on the added platforms

What steps will reproduce the problem?
(1) Go to http://permission.site and click Notification to open a permissions popover
(2) Click on the page to move the focus out of the popover
(3) F6 or Search+6 to focus Omnibox and shift-tab or tab to try to access to the popover

tapted, I think you are working on this for MacViews? this is the Cocoa dialog.

I'm working on improving the initial announcement -  Issue 748221 . But haven't looked at this, and don't know the right fix. It's a separate window so Tab/Shift+Tab doesn't seem to me like it should jump into another window (a11y experts?).

The dialogs take focus, so you need an unusual repro to get into the "keyboard-inaccessible" state. That is, I don't think we should focus on clicking being required to enter a state that requires more clicking to be accessible again.

But, you can enter the inaccessible state with Cmd+` on Mac. That cycles windows, and the permissions dialog isn't in the window cycle list. That should be easy to fix.

We could also allow the dialog to be refocussed if a website requests it again (and the dialog is still showing). However, maybe that can be abused.

Mac also has Ctrl+F6 "Move focus to the floating window", but I don't know how that's supposed to work, or if a11y users make use of it normally.

David added support for Alt+Shift+A to focus a popover

Need to maybe add F6 support

Make sure this announces when it opens

Peter is working on adding F6 support for bubbles, maybe reassign to him?

Not actively working on it anymore (got assigned to material design refresh work which takes >=100% of my time), I added F6 support for location-bar icons as a quick-and-dirty fix to make the state of the world a little bit better.

See  issue 764918  which I think should be the master bug for a unified strategy fixing all of them. If you want an off-by-one fix for this perhaps LocationBarView::ActivateFirstInactiveBubbleForAccessibility could be extended so that it can reach this dialog.

Assigning back to previous owner as I'll be swamped with the MD refresh work.

The issue described is not solved by the alt+shift+a or f6 fixes.
the only way to refocus the unfocused popover is to click into it.

Right, this is because the f6/alt+shift+a solutions only find bubbles if they are part of the location bar bubble icons, there's no GetAllBubblesFor(window_) equivalent which would probably be the right thing to do.