Add "Accessibility considerations" for custom elements

Closes #5170.

Author: carmacleod

source

@@ -67527,6 +67527,14 @@ document.body.append(parent);
    <dd><code data-x="attr-face-readonly">readonly</code>, for <span data-x="form-associated custom element">form-associated custom elements</span></dd>
    <dd><code data-x="attr-fe-name">name</code>, for <span data-x="form-associated custom element">form-associated custom elements</span></dd>
    <dd>Any other attribute that has no namespace (see prose).</dd>
+   <dt><span
+   data-x="concept-element-accessibility-considerations">Accessibility considerations</span>:</dt>
+   <dd>For <span data-x="form-associated custom element">form-associated custom elements</span>: <a
+   href="https://w3c.github.io/html-aria/#el-form-associated-custom-element">for authors</a>; <a
+   href="https://w3c.github.io/html-aam/#el-form-associated-custom-element">for implementers</a>.</dd>
+   <dd>Otherwise: <a
+   href="https://w3c.github.io/html-aria/#el-autonomous-custom-element">for authors</a>; <a
+   href="https://w3c.github.io/html-aam/#el-autonomous-custom-element">for implementers</a>.</dd>
    <dt><span data-x="concept-element-dom">DOM interface</span>:</dt>
    <dd>Supplied by the element's author (inherits from <code>HTMLElement</code>)</dd>
   </dl>