Re: [whatwg/dom] Introduce DOM post-insertion steps (PR #1261)

@smaug---- commented on this pull request.



> @@ -2752,6 +2812,16 @@ before a <var>child</var>, with an optional <i>suppress observers flag</i>, run
  <var>parent</var> with <var>nodes</var>, « », <var>previousSibling</var>, and <var>child</var>.
 
  <li><p>Run the <a>children changed steps</a> for <var>parent</var>.
+
+ <li>
+  <p>For each <var>node</var> in <var>nodes</var>, in <a>tree order</a>:
+
+  <ol>
+   <li><p>For each <a>shadow-including inclusive descendant</a> <var>inclusiveDescendant</var> of
+   <var>node</var>, in <a>shadow-including tree order</a>, run the <a>post-insertion steps</a> with
+   <var>inclusiveDescendant</var>.
+  </ol>
+ </li>

Script runners are like the nano tasks which were discussed years ago. Basically a thing which runs something which may trigger script execution, and runs at safe time. Very similar to post-insertion steps. But the key difference is that those aren't bound strictly to any node.  And you may create script runners (and often do) during insertion steps.

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