[Webkit-unassigned] [Bug 185679] New: AX: Element not exposed to accessibility tree when it is set to display: contents

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=185679

            Bug ID: 185679
           Summary: AX:  Element not exposed to accessibility tree when it
                    is set to display: contents
           Product: WebKit
           Version: Safari 11
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Accessibility
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hidde at hiddedevries.nl
                CC: webkit-bug-importer at group.apple.com

CSS Grid works on direct children of the grid container. To be able to place ‘grand children’ onto a CSS Grid, one can set 'display: contents' to a grid item. Its children can then be placed on the grid. 

When the  grid item is set to `display: contents` in CSS, its accessible role changes to ‘text leaf’.

Steps to reproduce:

1. Create a grid by setting 'display: grid' on a div element
2. Place some HTML in it, and make on of the items a <ul> with a couple of <li> elements
3. Inspect the <ul> item in the accessibility tree and see that it has role=list
4. Set 'display: contents' on the UL with CSS

Expected result: UL still has accessible role of 'list'. The CSS only affects the layout.

Actual result: UL element now reports 'No accessibility information' 

(Codepen example: https://codepen.io/hidde/pen/gzbMeL; blog post with use case: https://hiddedevries.nl/en/blog/2018-04-21-more-accessible-markup-with-display-contents)

The bug also occurs in Blink (https://bugs.chromium.org/p/chromium/issues/detail?id=835455); it has recently been fixed in Firefox (https://bugzilla.mozilla.org/show_bug.cgi?id=1455357).

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