Make behavior of autocapitalize attribute consistent for all form-ass…

…ociated elements

source

@@ -74362,7 +74362,9 @@ body { display:none }
   data-x="editing host">editing host</span> to control autocapitalization behavior for the hosted
   editable region, on an <code>input</code> or <code>textarea</code> element to control the behavior
   for inputting text into that element, or on a <code>form</code> element to control the default
-  behavior for that form's <code>input</code> and <code>textarea</code> elements.</p>
+  behavior for that form's <code>input</code> and <code>textarea</code> elements (note: a few other
+  form-related elements that aren't typically used for text input also inherit the value of the IDL
+  attribute; see the <span>own autocapitalization hint</span> algorithm for details).</p>
 
   <p>The <code data-x="attr-autocapitalize">autocapitalize</code> attribute never causes
   autocapitalization to be enabled for <code>input</code> elements whose <code
@@ -74459,9 +74461,21 @@ body { display:none }
    present on <var>element</var>, and its value is not the empty string, return the state of the
    attribute.</p></li>
 
-   <li><p>If <var>element</var> is an <code>input</code> or <code>textarea</code> element and has a
-   non-null <span>form owner</span>, return the <span>own autocapitalization hint</span> of
-   <var>element</var>'s <span>form owner</span>.</p></li>
+   <li>
+    <p>If <var>element</var> is one of the following elements:</p>
+
+    <ul>
+     <li><p><code>button</code></p></li>
+     <li><p><code>fieldset</code></p></li>
+     <li><p><code>input</code></p></li>
+     <li><p><code>output</code></p></li>
+     <li><p><code>select</code></p></li>
+     <li><p><code>textarea</code></p></li>
+    </ul>
+
+    <p>return the <span>own autocapitalization hint</span> of <var>element</var>'s <span>form
+    owner</span>.</p>
+   </li>
 
    <li><p>Return <span data-x="autocap-hint-default">default</span>.</p></li>
   </ol>