Remove redundant UA CSS requirement

index.html

@@ -788,9 +788,7 @@ <h2>Non-interference with the Host Language</h2>
           language.
         </p>
         <p>
-          If a CSS selector includes a WAI-ARIA attribute (e.g., <code class="highlight css">input[aria-invalid="true"]</code>), user agents MUST update the visual display of any elements matching (or
-          no longer matching) the selector any time the attribute is added/changed/removed in the <abbr title="Document Object Model">DOM</abbr>. The user agent MAY alter the mapping of the host
-          language features into an <a>accessibility <abbr title="Application Programming Interface">API</abbr></a
+          User agents MAY alter the mapping of host language features into an <a>accessibility <abbr title="Application Programming Interface">API</abbr></a
           >, but the user agent MUST NOT alter the <abbr title="Document Object Model">DOM</abbr> in order to remap <abbr title="Accessible Rich Internet Applications">WAI-ARIA</abbr> markup into host
           language features.
         </p>
@@ -901,10 +899,8 @@ <h2><abbr title="Accessible Rich Internet Applications">WAI-ARIA</abbr> States a
         </p>
         <p>
           Most modern user agents support
-          <cite
-            ><a href="https://www.w3.org/TR/css3-selectors/#attribute-selectors"><abbr title="Cascading Style Sheets">CSS</abbr> attribute selectors</a></cite
-          >
-          ([[CSS3-SELECTORS]]), and can allow the author to create <abbr title="User Interface">UI</abbr> changes based on <abbr title="Accessible Rich Internet Applications">WAI-ARIA</abbr> attribute
+
+          CSS [=attribute selectors=] ([[SELECTORS-4]]) and allow the author to create <abbr title="User Interface">UI</abbr> changes based on <abbr title="Accessible Rich Internet Applications">WAI-ARIA</abbr> attribute
           information, reducing the amount of scripts necessary to achieve equivalent functionality. In the following example, a <abbr title="Cascading Style Sheets">CSS</abbr> selector is used to
           determine whether or not the text is bold and an image of a check mark is shown, based on the value of the <sref>aria-checked</sref> attribute.
         </p>
@@ -16559,17 +16555,6 @@ <h3>ID Reference Error Processing</h3>
           </p>
         </section>
       </section>
-      <section id="document-handling_css-selectors">
-        <h3>CSS Selectors</h3>
-        <p class="note">This section might be removed in a future version.</p>
-        <p>
-          Support for <a class="termref">attribute</a> selectors MUST include <abbr title="Accessible Rich Internet Application">WAI-ARIA</abbr> attributes. For example,
-          <samp>.fooMenuItem[aria-haspopup=&quot;true&quot;]</samp> would select all [=elements=] with class <code>fooMenuItem</code>, and
-          <abbr title="Accessible Rich Internet Application">WAI-ARIA</abbr> property <pref>aria-haspopup</pref> with value of <code>true</code>. The presentation MUST be updated for dynamic changes
-          to <abbr title="Accessible Rich Internet Application">WAI-ARIA</abbr> attributes. This allows authors to match styling with
-          <abbr title="Accessible Rich Internet Application">WAI-ARIA</abbr> <a>semantics</a>.
-        </p>
-      </section>
     </section>
     <section id="document-handling_author-errors">
       <h2>Handling Author Errors</h2>