Re: [whatwg/dom] Add Imperative Slot API (#860)

@yuzhe-han commented on this pull request.



> @@ -2450,7 +2454,8 @@ before a <var>child</var>, with an optional <i>suppress observers flag</i>, run
    <li><p>Otherwise, <a for=set>insert</a> <var>node</var> into <var>parent</var>'s
    <a for=tree>children</a> before <var>child</var>'s <a for=tree>index</a>.
 
-   <li><p>If <var>parent</var> is a <a for=Element>shadow host</a> and <var>node</var> is a
+   <li><p>If <var>parent</var> is a <a for=Element>shadow host</a> with its <a for=tree>root</a>'s
+   <a for=ShadowRoot>slot assignment</a> set to "<code>auto</code>" and <var>node</var> is a
    <a>slottable</a>, then <a>assign a slot</a> for <var>node</var>.
 
    <li><p>If <var>parent</var>'s <a for=tree>root</a> is a <a for=/>shadow root</a>, and

This step, 
   ** If parent’s root is a shadow root, and parent is a slot whose assigned nodes is the empty list, then run signal a slot change for parent. **
   is to signal slot change event because the slot's fallback content has changed. 

For slot assignment "manual", the slot still supports fallback content. 

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