[Webkit-unassigned] [Bug 176615] New: AX: VoiceOver iframe scrolling focus jumping bug

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=176615

            Bug ID: 176615
           Summary: AX: VoiceOver iframe scrolling focus jumping bug
           Product: WebKit
           Version: Safari 10
          Hardware: All
                OS: All
            Status: NEW
          Severity: Blocker
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: paul at pauljadam.com
                CC: webkit-bug-importer at group.apple.com

Created attachment 320276

  --> https://bugs.webkit.org/attachment.cgi?id=320276&action=review

showing iframe has focus but page is visually scrolled to the very top and you can't see the iframe

It's not possible to tab or swipe to iframe content using VoiceOver and Safari because once you tab or swipe into the content the page scrolls up to the top and you can't see your focus. 

Steps to reproduce bug:

1. Turn VoiceOver On.
2. Visit demo page at http://pauljadam.com/demos/iframe-voiceover-scrolling-bug.html
3. Tab through page and iframe content at bottom of the page in Safari macOS or swipe through page in Safari iOS.

Expected results:

Page scrolls normally as you tab or swipe through the page without any browser scroll jumping up and down the page. Focused item always remains visible.

Actual results:

Once you focus on the iframe content the page abruptly jumps up and down from the top to bottom of the page as you tab and swipe through the iframe elements. It's impossible to see the focused element because the window always scrolls to the very top of the page.

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