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Thread: Accessible Location List with Key
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From: Matt Thompson
Date: Tue, Apr 19 2016 11:33AM
Subject: Accessible Location List with Key
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Hi,
I'm trying to make a list of locations accessible to screen readers.
One column on the page has a key with an icon and description for each location type.
<ul class="key">
<li id="type1"><span class="key-marker circle blue"></span>Type 1</li>
<li id="type2"><span class="key-marker square-outline orange"></span>Type 2</li>
<li id="type3"><span class="key-marker pink"></span>Type 3</li>
</ul>
Another column has a list of locations as links grouped by country with one or more type icons next to each.
<p><a href="phoenix.html" aria-labelledby="type1 type2">Phoenix</a> <span class="key-marker pink"></span><span class="key-marker square-outline orange"></span></p>
Ideally, when a screen reader focuses on the link, I want it to say the link text followed by the types. For example, the above item should read "Phoenix [pause] is a "Type 1" and a "Type 2". I'm struggling to figure out how to do this.
I don't have JAWS so I'm testing with both VoiceOver, the screen reader built into Mac OS X, and ChromeVox, a screen reader extension for Chrome. I've tried "aria-describedby", but neither read it, only "aria-labelled-by" works. With aria-labelledby on the link, VoiceOver reads "link Phoenix Type 1 Type 2" with no separation so it's confusing to a user to know what the link text is versus a description. ChromeVox doesn't read the link text, just "Type 1 Type 2".
Matt
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From: Bryan Garaventa
Date: Tue, Apr 19 2016 12:04PM
Subject: Re: Accessible Location List with Key
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To do this , you need to use aria-describedby and not aria-labelledby.
E.G
<p><a href="phoenix.html" aria-describedby="type1 type2">Phoenix</a> <span class="key-marker pink"></span><span class="key-marker square-outline orange"></span></p>
When you use aria-label or aria-labelledby, you are basically saying that you want that to be the explicit label by setting the Name property for that widget and not the internal text. Setting aria-describedby sets two different properties however, the Name using the inner text, and the Description using the aria-describedby attribute.
So if you do this, when you tab to the link, it will announce both.
All of this is more fully described at
http://www.ssbbartgroup.com/blog/how-the-w3c-text-alternative-computation-works/
All the best,
Bryan
Bryan Garaventa
Accessibility Fellow
SSB BART Group, Inc.
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