w3c
diff --git a/‎index.html‎
Lines changed: 5 additions & 2 deletions b/‎index.html‎
Lines changed: 5 additions & 2 deletions
@@ -11880,7 +11880,7 @@ <h3>Value</h3>
               <code>undefined</code> is not expandable.
             </dd>
             <dt id="valuetype_idref">ID reference</dt>
-            <dd>Reference to the ID of another <a>element</a> in the same document</dd>
+            <dd>Reference to the ID of another <a>element</a> in the same document.</dd>
             <dt id="valuetype_idref_list">ID reference list</dt>
             <dd>A list of one or more ID references.</dd>
             <dt id="valuetype_integer">integer</dt>
@@ -16519,7 +16519,10 @@ <h2>State and Property Attribute Processing</h2>
         </p>
         <section id="mapping_additional_relations_error_processing">
           <h3>ID Reference Error Processing</h3>
-          <p>[=user agents=] SHOULD ignore ID references that do not match the ID of another <a>element</a> in the same document.</p>
+          <p>
+            The author MAY set either an empty value or a value that does not match the ID of another <a>element</a> in the same document. This flexibility acknowledges the dynamic nature of modern
+            websites, where the DOM can be populated accordingly when necessary. [=user agents=] SHOULD ignore ID references that do not match the ID of another <a>element</a> in the same document.
+          </p>
           <p>
             It is the author's responsibility to ensure that IDs are unique. If more than one element has the same ID, the user agent SHOULD use the first element found with the given ID. The behavior
             will be the same as <code>getElementById</code>.