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revise caption definition
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This change in the definition is related to the changes in `figure` and `figcaption` in HTML AAM: w3c/html-aam#359 and introduces the idea that a `caption` may contain structured content - and in this PR - `aria-details` is referenced as a way authors should reference such content if within a `caption`

Additionally, this PR extends the definition to allow `caption` to be used for purposes of naming/describing a `group` or `radiogroup`, which fills some gaps from the dropped `legend` role.

If these updates are accepted, this would help pave the way to resolve #1696 as well.
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@scottaohara
scottaohara authored Mar 12, 2022
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46 changes: 39 additions & 7 deletions index.html
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Expand Up @@ -1790,15 +1790,25 @@ <h2>Definition of Roles</h2>
<div class="role" id="caption">
<rdef>caption</rdef>
<div class="role-description">
<p>Visible content that names, and may also describe, a <rref>figure</rref>, <rref>table</rref>, <rref>grid</rref>, or <rref>treegrid</rref>.</p>
<p>Visible content that names, or describes a <rref>group</rref>, <rref>figure</rref>, <rref>table</rref>, <rref>grid</rref>, <rref>radiogroup</rref>, or <rref>treegrid</rref>.</p>
<p>When using <code>caption</code> authors SHOULD ensure:</p>
<ul>
<li>The <code>caption</code> is a direct child of a <rref>figure</rref>, <rref>table</rref>, <rref>grid</rref>, or <rref>treegrid</rref>.</li>
<li>The <code>caption</code> is the first child of a <rref>table</rref>, <rref>grid</rref>, or <rref>treegrid</rref>.</li>
<li>The <code>caption</code> is the first or last child of a <rref>figure</rref>.</li>
<li>The <code>caption</code> is a direct child of a <rref>group</rref>, <rref>figure</rref>, <rref>grid</rref>, <rref>radiogroup</rref>, <rref>table</rref>, or <rref>treegrid</rref>.</li>
<li>The <code>caption</code> is the first non-<code>generic</code> child of a <rref>group</rref>, <rref>radiogroup</rref>, <rref>grid</rref>, <rref>table</rref>, or <rref>treegrid</rref>.</li>
<li>The <code>caption</code> is the first or last non-<code>generic</code> child of a <rref>figure</rref>.</li>
</ul>
<p>Authors SHOULD set <pref>aria-labelledby</pref> on the parent <code>figure</code>, <code>table</code>, <code>grid</code>, or <rref>treegrid</rref> to reference the element with role <code>caption</code>. However, if a <code>caption</code> contains content that serves as both a name and description for its parent, authors MAY instead set <pref>aria-labelledby</pref> to reference an element within the <code>caption</code> that contains a concise name, and set <pref>aria-describedby</pref> to reference an element within the <code>caption</code> that contains the descriptive content.</p>

<p>If the <code>caption</code> represents an accessible name for its containing element, authors SHOULD specify <pref>aria-labelledby</pref> on the parent element to reference the element with role <code>caption</code>.</p>

<pre class="example highlight">
&lt;div role="radiogroup" aria-labelledby="name"&gt;
&lt;div role="caption"&gt;
Choose your favorite fruit
&lt;/div&gt;
&lt;!-- ... --&gt;
</pre>

<p>If a <code>caption</code> contains content that serves as both a name and description for its parent, authors MAY instead specify <pref>aria-labelledby</pref> to reference an element within the <code>caption</code> that represents the "name" of the parent element, and specify <pref>aria-describedby</pref> to reference an element within the <code>caption</code> that contains the descriptive content.</p>

<pre class="example highlight">
&lt;div role="table" aria-labelledby="name" aria-describedby="desc"&gt;
&lt;div role="caption"&gt;
Expand All @@ -1810,6 +1820,24 @@ <h2>Definition of Roles</h2>
&lt;/div&gt;
&lt;!-- ... --&gt;
</pre>

<p>If the <code>caption</code> represents a long-form description, or if the description contains semantic elements which are important in understanding the description, authors MAY instead specify <pref>aria-labelledby</pref> to reference an element within the <code>caption</code> that represents the "name" of the parent element, and specify <pref>aria-details</pref> to reference an element within the <code>caption</code> that contains the descriptive content.</p>

<pre class="example highlight">
&lt;div role="figure" aria-labelledby="name" aria-details="details"&gt;
&lt;!-- figure content here, such as a complex data viz SVG -->
&lt;div role="caption"&gt;
&lt;div id="name"&gt;Sales information for 20XX&lt;/div&gt;
&lt;div id="details"&gt;
This barchart represents the total amount of sales over the course
of five years. <a href="...">Sales information for last year</a> can
be reviewed, or you can overlay <button aria-pressed="false">previous year</button>
information in this graphic.
&lt;/div&gt;
&lt;/div&gt;
&lt;!-- ... --&gt;
</pre>

</div>
<table class="role-features">
<caption>Characteristics:</caption>
Expand Down Expand Up @@ -1838,7 +1866,11 @@ <h2>Definition of Roles</h2>
</tr>
<tr>
<th class="role-related-head" scope="row">Related Concepts:</th>
<td class="role-related"><code>&lt;caption&gt;</code> in [[HTML]] <br/> <code>&lt;figcaption&gt;</code> in [[HTML]]</td>
<td class="role-related">
<code>&lt;caption&gt;</code> in [[HTML]] <br>
<code>&lt;figcaption&gt;</code> in [[HTML]] <br>
<code>&lt;legend&gt;</code> in [[HTML]]
</td>
</tr>
<tr>
<th class="role-scope-head" scope="row">Required Context Role:</th>
Expand Down

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