User-Agent: Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.1; Trident/4.0; SLCC2; .NET CLR 2.0.50727; .NET CLR 3.5.30729; .NET CLR 3.0.30729; Media Center PC 6.0; Tablet PC 2.0; MALC)
Build Identifier: Firefox 3.6.12
Open any web page. Use Shift+Tab repeatedly until focus is on top most item in the page. Press Shift+Tab again and note that no FocusChanged event is fired. Therefore, screen readers do not know that focus has moved to the document.
This is confirmed with NVDA, too.
Is it regression? How bad is this bug from user experience point?
From Frank on 12/10/2010:
Yes, it is a regression. It does not fail in FF 3.5.11.
I expect it is not a great huge deal for screen reader user, but it is confusing.
*** Bug 644455 has been marked as a duplicate of this bug. ***
As noted in bug 644455, this also occurs when shift+tabbing to the top of an iframe document.
Enn, do I understand right that DOM focus event is not fired for DOM document in this case because it's considered that DOM document focus state wasn't changed (it had focus when its child element was focused and it has focus when it's focused)? If this is correct then how would I catch this case to fire a11y focus event (in sense what events could I listen or what algorithm could be)?
That's correct. The document is still focused, but the content that was focused received a blur event, which you can listen for.
*** Bug 661623 has been marked as a duplicate of this bug. ***
I verified that this is fixed in the last try build for bug 673958.
fixed by bug 673958
Verified fixed in Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0a1) Gecko/20110929 Firefox/10.0a1