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* revise caption definition
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.
* add in missing id to first example
* fix spacing issues
* include additional example
Copy file name to clipboardExpand all lines: index.html
+53-7Lines changed: 53 additions & 7 deletions
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@@ -1790,15 +1790,25 @@ <h2>Definition of Roles</h2>
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<div class="role" id="caption">
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<rdef>caption</rdef>
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<div class="role-description">
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<p>Visible content that names, and may also describe, a <rref>figure</rref>, <rref>table</rref>, <rref>grid</rref>, or <rref>treegrid</rref>.</p>
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<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>
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<p>When using <code>caption</code> authors SHOULD ensure:</p>
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<ul>
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<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>
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<li>The <code>caption</code> is the first child of a <rref>table</rref>, <rref>grid</rref>, or <rref>treegrid</rref>.</li>
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<li>The <code>caption</code> is the first or last child of a <rref>figure</rref>.</li>
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<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>
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<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>
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<li>The <code>caption</code> is the first or last non-<code>generic</code> child of a <rref>figure</rref>.</li>
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</ul>
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<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>
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<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>
<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 represents the descriptive content.</p>
@@ -1810,6 +1820,38 @@ <h2>Definition of Roles</h2>
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</div>
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<!-- ... -->
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</pre>
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<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>
<!-- figure content here, such as a complex data viz SVG -->
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<div role="caption">
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<div id="name">Sales information for 20XX</div>
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<div id="details">
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This barchart represents the total amount of sales over the course
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of five years. <a href="...">Sales information for last year</a> can
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be reviewed, or you can overlay <button aria-pressed="false">previous year</button>
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information in this graphic.
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</div>
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</div>
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<!-- ... -->
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</pre>
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<p>There may be instances where a <code>caption</code> contains only a description, without a suitable text string to serve as the accessible name for the parent element. In such instances, <pref>aria-label</pref> or <pref>aria-labelledby</pref> MAY be used to provide an accessible name, and the <code>caption</code> MAY be treated solely as descriptive content.
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