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[Bug 21579] New: Empty @alt should not imply role="presentation" if the <img> has @usemap

From: <bugzilla@jessica.w3.org>
Date: Thu, 04 Apr 2013 13:46:29 +0000
To: public-html-admin@w3.org
Message-ID: <bug-21579-2495@http.www.w3.org/Bugs/Public/>

            Bug ID: 21579
           Summary: Empty @alt should not imply role="presentation" if the
                    <img> has @usemap
    Classification: Unclassified
           Product: HTML WG
           Version: unspecified
          Hardware: PC
               URL: http://www.w3.org/TR/html5/dom.html#sec-strong-native-
                OS: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: HTML5 spec
          Assignee: dave.null@w3.org
          Reporter: xn--mlform-iua@xn--mlform-iua.no
        QA Contact: public-html-bugzilla@w3.org
                CC: faulkner.steve@gmail.com, mike@w3.org,

See comment number 10 in bug 21565


If empty @alt on @usemap were to imply role="presentation", then the entire
image map would have to stop working. This follows from ARIA’s requirement that
elements that are "linked" should be altogether disabled if one disables the
"main" elment. (E.g. if you do <table role="presentation">, then all the
childrene elements will be disabled as well)

Looking in Safari + VoiceOver, there is thus a difference between doing

1) <img role="presentation" usemap="#map" alt="alt" src="src" />

on one side, and on the other side only use empty alt:

2) <img usemap="#map" alt="" src="src" />

In the first case, the entire image map stops working, while in the other case,
the image map works just fine. (Also, in Safari + VoiceOver, the alt of the img
in the image map seems to not be presented to the user - only the alt of the
area elements are presented.)

I think we can take for granted that there are many image maps around where
there is an empty @alt, and where the author have not intended that this would
make the image map stop working in AT.

Further more, adding role="presentation" on an anchor element does as well not
remove its interactivity. And given that image maps are links, to the extent
that HTML5 requires the CSS img:link{} selector work for images that are image
maps, it does not make sense to say that empty alt should remove the image map
<img> elements from the accessibility tree.

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Received on Thursday, 4 April 2013 13:46:35 UTC

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