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Add nameFrom: heading to AccName text alt algorithm #229

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Add nameFrom: heading to AccName text alt algorithm #229

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Expand Up @@ -487,6 +487,7 @@ <h4>Computation steps</h4>
<p>For example, in <abbr title="Hypertext Markup Language">HTML</abbr>, the <code>img</code> element's <code>alt</code> attribute defines a text alternative string, and the <code>label</code> element provides text for the referenced form element. In <abbr title="SVG2">SVG2</abbr>, the <code>desc</code> and <code>title</code> elements provide a description of their parent element. </p>
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</li>
<li id="comp_name_from_heading"><em>Name From Heading:</em> Otherwise, if the <code>current node</code> has a role that supports <a href="https://w3c.github.io/aria/#namefromheading">nameFrom: heading</a>, return the text alternative of the first descendant <a>element</a> node matching the role of <code>heading</code> in an <em>iterative deepening depth-first search.</em></li>
<li id="comp_name_from_content"><span id="step2F"><!-- Don't link to this legacy numbered ID. --></span><em>Name From Content:</em> Otherwise, if the <code>current node's</code> <a class="termref">role</a> allows <a class="specref" href="#namefromcontent">name from content</a>, or if the <code>current node</code> is referenced by <code>aria-labelledby</code>, <code>aria-describedby</code>, or is a native host language text alternative [=element=] (e.g. <code>label</code> in HTML), or is a descendant of a native host language text alternative [=element=]:
<ol>
<li id="comp_name_from_content_reset"><span id="step2F.i"><!-- Don't link to this legacy numbered ID. --></span><em>Name From Content Reset:</em> Set the <code>accumulated text</code> to the empty string.</li>
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