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This was implemented in Firefox here: https://bugzilla.mozilla.org/show_bug.cgi?id=658272 The example is as follows: <figure id="figure"> <figcaption id="figcaption">figure caption</figcaption> </figure> Roles: accessible representing element with id:"figure", has ROLE_SYSTEM_GROUPING (Win), ATK_ROLE_PANEL (Linux) accessible representing element with id:"figcaption", has IA2_ROLE_CAPTION (Win), ATK_ROLE_CAPTION (Linux) Relations: accessible representing element with id:"figure" has RELATION_LABELLED_BY "figcaption". accessible representing element with id:"figcaption" has RELATION_LABEL_FOR "figure". Object Attribute: accessible representing element with id:"figure" has object attribute "xml-roles:figure".
fixed by bug 12703