Using suffix Element/s for IDL attributes referring to elements

Fixes #1732

index.html

@@ -13831,7 +13831,7 @@ <h3>Disambiguation Pattern</h3>
 				<li>If all trusted dictionary sources list a single spelling of a compound word with no spaces or hyphens, only the first letter of the term is capitalized. For example, neither “place-holder” nor “place holder” are considered valid spellings of the term “placeholder,” so <pref>aria-placeholder</pref> becomes <code>ariaPlaceholder</code> with only the P capitalized.</li>
 				<li>There are currently no acronym-based ARIA attributes, but if future attributes include acronym usage, attempt to match existing DOM conventions (e.g. ID becomes Id).</li>
 			</ul>
-		</section>
+			<p class="note">The specification does not currently define IDL attributes for ARIA content attributes of types ID reference or ID reference list. Naming of these IDL attributes is being <a href="https://github.com/whatwg/html/issues/3515">discussed</a> and may not follow the rules above.</p>
 		<section class="informative" id="idl_attr_exceptions">
 			<h3>IDL Attribute Name Notes or Exceptions</h3>
 			<p>Any notes or exceptions for specific attribute names will be listed here.</p>