Updates to include manuallyAssignedNodes.

dom.bs

@@ -2195,24 +2195,9 @@ steps:</p>
  <li><p>If the <i>open flag</i> is set and <var>shadow</var>'s <a for=ShadowRoot>mode</a> is
  <em>not</em> "<code>open</code>", then return null.</p></li>
 
- <li><p>If the shadow's <a for=ShadowRoot>slot assignment</a> is set to "<code>manual</code>", then:</p>
-  <ol>
-   <li><p>Let <var>manuallyAssignedNodes</var> be nodes that are
-   <a href="https://html.spec.whatwg.org/multipage/scripting.html#dom-slot-assign"><code>assigned</code></a>
-   to a <a>slot</a> in <var>shadow</var>'s <a for=tree>descendants</a>.</p></li>
-
-   <li><p>If <var>nodeSlotMap</var> doesn't exists, let <var>nodeSlotMap</var> be an empty <a for=/>map</a>.</p></li>
-
-   <li><p>For each <var>node</var> in <var>manuallyAssignedNodes</var>, set <var>nodeSlotMap[node]</var>
-   to <a>slot</a>.</p></li>
-
-   <li><p>Set <var>manuallyAssignedNodes</var> to empty list.</p></li>
-
-   <li><p>If <var>nodeSlotMap[slottable]</var> exists, then return <var>nodeSlotMap[slottable]</var>.</p></li>
-
-   <li><p>Return null.</p></li>
-  </ol>
- </li>
+ <li><p>If the <var>shadow</var>'s <a for=ShadowRoot>slot assignment</a> is set to "<code>manual</code>",
+ return the associated slot in <var>shadow</var>'s tree whose <a>manuallyAssignedNodes</a> includes
+ <var>slottable</var>, if any, and null otherwise.</p></li>
 
  <li><p>Return the first <a>slot</a> in <a>tree order</a> in <var>shadow</var>'s
  <a for=tree>descendants</a> whose <a for=slot>name</a> is <var>slottable</var>'s