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Geoffrey Sneddon committed 477c55f

xref uses interactive content or dfn to avoid instances.

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 present in <a href=http://whatwg.org/html5>HTML 5</a>. Similar to <a href=#definition title=definition>definitions</a>, the <a href=#instance>instance</a> is taken from
 the <code>title</code> attribute if it is present, otherwise it is taken from
 the <a href=#textcontent>textContent</a> property. An <a href=#instance>instance</a> is only used if
-it does not have an <code>a</code>, <code>dfn</code>, or <code>datagrid</code>
-element as either a parent or a child.</p>
+it does not have an <a href=#interactive-content>interactive content</a> or <code>dfn</code> element
+as either a parent or a child.</p>
 
 <p>Both <a href=#definition title=definition>definitions</a> and <a href=#instance title=instance>instances</a> are <dfn id=cross-reference-normalization title="cross-reference
 normalization">normalized</dfn> as follows:</p>
 title="definition">definitions</span>, the <span>instance</span> is taken from
 the <code>title</code> attribute if it is present, otherwise it is taken from
 the <span>textContent</span> property. An <span>instance</span> is only used if
-it does not have an <code>a</code>, <code>dfn</code>, or <code>datagrid</code>
-element as either a parent or a child.</p>
+it does not have an <span>interactive content</span> or <code>dfn</code> element
+as either a parent or a child.</p>
 
 <p>Both <span title="definition">definitions</span> and <span
 title="instance">instances</span> are <dfn title="cross-reference