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

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



>  <!-- See https://github.com/whatwg/dom/issues/34#issuecomment-125571750 for why we might need to
      adjust this further based on the requirements of the script element. There might be other ways
      to define that though as Olli suggests, so leaving that out for now. -->
 
+<p><a lt="Other applicable specifications">Specifications</a> may also define <dfn export
+id=concept-node-post-insert-ext>post-insertion steps</dfn> for all or some <a for=/>nodes</a>. The
+algorithm is passed <var ignore>insertedNode</var>, as indicated in the <a
+for=/>insert</a> algorithm below.
+
+<p class=note>The purpose of the <a>post-insertion steps</a> is to provide an opportunity for <a
+for=/>nodes</a> to perform any insertion-related operations that modify the <a>node tree</a> that
+<var ignore>insertedNode</var> <a>participates</a> in, create <a for=/>browsing contexts</a>, or
+otherwise execute JavaScript. These steps allow a batch of <a>nodes</a> to be <a for=/>inserted</a>
+<i>atomically</i> with respect to script, with all major side effects occurring <i>after</i> the
+batch insertions into the <a>node tree</a> is complete, but before <a lt="notify mutation
+observers"><code>MutationObserver</code>s are notified</a>. This ensures that all pending <a>node

CE Reaction or what? That isn't when MutationObservers get notified. 

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