Improve authoring guidance based on feedback

mcking65 · mcking65 · commit 03732dc8437c · 2020-12-03T10:38:32.000-08:00
diff --git a/index.html b/index.html
@@ -6003,8 +6003,10 @@ <h5>Note regarding the ARIA 1.1 <code>none</code> role.</h5>
           Otherwise, if a user agent provides an implicit <sref>aria-selected</sref> value for an <rref>option</rref>, the value SHOULD be <code>false</code>.
         </p>
         <p>
-          The <rref>option</rref> role supports both <sref>aria-selected</sref> and <sref>aria-checked</sref> because it is recommended that authors indicate selection with <sref>aria-selected</sref> in single-select list boxes and with <sref>aria-checked</sref> in multi-select list boxes.
-          Authors SHOULD NOT specify both <sref>aria-selected</sref> and <sref>aria-checked</sref> on <rref>option</rref> elements contained by the same <rref>listbox</rref> except in the extremely rare circumstances where all the following conditions are met:
+          Authors MAY indicate selection for <rref>option</rref> elements  using either <sref>aria-selected</sref> or <sref>aria-checked</sref>.
+          Some user interfaces indicate selection with <sref>aria-selected</sref> in single-select list boxes and with <sref>aria-checked</sref> in multi-select list boxes.
+          Authors SHOULD NOT specify both <sref>aria-selected</sref> and <sref>aria-checked</sref> on <rref>option</rref> elements contained by the same <rref>listbox</rref>.
+          However, authors MAY use both in the extremely rare circumstances where all the following conditions are met:
         </p>
         <ul>
           <li>The meaning and purpose of <sref>aria-selected</sref> is different from the meaning and purpose of <sref>aria-checked</sref> in the user interface.</li>
