add shared picker dfn

source

@@ -48169,6 +48169,11 @@ interface <dfn interface>HTMLInputElement</dfn> : <span>HTMLElement</span> {
   data-x="attr-input-type-checkbox">Checkbox</span> state) stop an <code>input</code> element from
   being <i data-x="concept-fe-mutable">mutable</i>.</p>
 
+  <p>Some states of the <code data-x="attr-input-type">type</code> attribute <dfn
+  data-x="input-support-picker">support a picker</dfn>, which is a popup that allows the user to
+  choose a value. Which states <span data-x="input-support-picker">support a picker</span> is up to
+  the user agent.</p>
+
   <p>The <span data-x="concept-node-clone-ext">cloning steps</span> for <code>input</code> elements
   must propagate the <span data-x="concept-fe-value">value</span>, <span
   data-x="concept-fe-dirty">dirty value flag</span>, <span
@@ -52636,8 +52641,10 @@ You cannot submit this form when the field is incorrect.</samp></pre>
    <dt><code data-x=""><var>input</var>.<span subdfn data-x="dom-input-showPicker">showPicker</span>()</code></dt>
 
    <dd>
-    <p>Shows any applicable picker UI for <var>input</var>, so that the user can select a value. (If
-    no picker UI is implemented for the given control, then this method does nothing.)</p>
+    <p>If <var>input</var> does not <span data-x="input-support-picker">support a picker</span>,
+    this method does nothing.</p>
+
+    <p>Shows any applicable picker UI for <var>input</var>, so that the user can select a value.</p>
 
     <p>Throws an <span>"<code>InvalidStateError</code>"</span> <code>DOMException</code> if
     <var>input</var> is not <span data-x="concept-fe-mutable">mutable</span>.</p>
@@ -74811,8 +74818,8 @@ Demos:
      <li><p>A <code>select</code> element which is a <span>drop-down box</span> whose drop-down box
      is open.</p></li>
 
-     <li><p>An <code>input</code> element which supports a picker popup and whose picker popup is
-     open.</p></li>
+     <li><p>An <code>input</code> element which <span data-x="input-support-picker">supports a
+     picker</span> popup and whose picker popup is open.</p></li>
     </ol>
    </dd>
   </dl>