Add <slot>.assignedElements()

Equivalent to assignedNodes(), limited to returning element nodes.

Tests: web-platform-tests/wpt#8636.

Fixes WICG/webcomponents#602.

Author: cyrilletuzi

source

@@ -59014,6 +59014,7 @@ interface <dfn>HTMLTemplateElement</dfn> : <span>HTMLElement</span> {
 interface <dfn>HTMLSlotElement</dfn> : <span>HTMLElement</span> {
   [<span>CEReactions</span>] attribute DOMString <span data-x="dom-slot-name">name</span>;
   sequence&lt;Node> <span data-x="dom-slot-assignedNodes">assignedNodes</span>(optional <span>AssignedNodesOptions</span> options);
+  sequence&lt;Element> <span data-x="dom-slot-assignedElements">assignedElements</span>(optional <span>AssignedNodesOptions</span> options);
 };
 
 dictionary <dfn>AssignedNodesOptions</dfn> {
@@ -59052,6 +59053,13 @@ dictionary <dfn>AssignedNodesOptions</dfn> {
    <dd>Returns <var>slot</var>'s <span>assigned nodes</span>, if any, and <var>slot</var>'s children
    otherwise, and does the same for any <code>slot</code> elements encountered therein, recursively,
    until there are no <code>slot</code> elements left.</dd>
+
+   <dt><var>slot</var> . <code subdfn data-x="dom-slot-assignedElements">assignedElements</code>()</dt>
+   <dd>Returns <var>slot</var>'s <span>assigned nodes</span>, limited to elements.</dd>
+
+   <dt><var>slot</var> . <code data-x="dom-slot-assignedElements">assignedElements</code>({ flatten: true })</dt>
+   <dd>Returns the same as <code data-x="dom-slot-assignedNodes">assignedNodes({ flatten: true
+   })</code>, limited to elements.</dd>
   </dl>
 
   <p>The <dfn data-x="dom-slot-name"><code>name</code></dfn> IDL attribute must <span>reflect</span>
@@ -59067,6 +59075,18 @@ dictionary <dfn>AssignedNodesOptions</dfn> {
    <li><p>Return the result of <span>finding flattened slotables</span> with this element.</p></li>
   </ol>
 
+  <p>The <dfn data-x="dom-slot-assignedElements"><code>assignedElements(<var>options</var>)</code></dfn>
+  method, when invoked, must run these steps:</p>
+
+  <ol>
+   <li><p>If the value of <var>options</var>'s <code data-x="">flatten</code> member is false, then
+   return this element's <span>assigned nodes</span>, filtered to contain only <code>Element</code>
+   nodes.</p></li>
+
+   <li><p>Return the result of <span>finding flattened slotables</span> with this element, filtered
+   to contain only <code>Element</code> nodes.</p></li>
+  </ol>
+
 
 
   <h4 split-filename="canvas">The <dfn id="canvas"><code>canvas</code></dfn> element</h4>
@@ -120846,6 +120866,7 @@ INSERT INTERFACES HERE
   Csaba Gabor,
   Csaba Marton,
   Cynthia Shelly,
+  Cyrille Tuzi,
   Daksh Shah,
   Dan Callahan,
   Dan Ehrenberg,
@@ -121509,6 +121530,7 @@ INSERT INTERFACES HERE
   Tim Altman,
   Tim Johansson,
   Tim Perry,
+  Tim van der Lippe,
   TJ VanToll,
   Tobias Schneider,
   Tobie Langel,