Do not do special range handling

dom.bs

@@ -2910,17 +2910,16 @@ a <var>child</var>, run these steps:
 
  <li><p>Let <var>index</var> be <var>node</var>'s <a for=tree>index</a>.
 
- <li>
-  <p>For each <a>live range</a> whose <a for=range>start node</a> is <var>parent</var> and
-  <a for=range>start offset</a> is greater than <var>index</var>, decrease its
-  <a for=range>start offset</a> by 1.</p>
-
-  <p class="note">Note that unlike the traditional <a for=/ lt="remove">removal</a> case, we do not
-  need to update <a>live range</a> state when their <a for=range>start node</a> or
-  <a for=range>end node</a> is an <a>inclusive descendant</a> of the <var>node</var>. This is
-  because said <a>nodes</a> do not get removed from their <a>tree</a>, so ranges associated with
-  them stay intact.</p>
- </li>
+ <li><p>For each <a>live range</a> whose <a for=range>start node</a> is an
+ <a>inclusive descendant</a> of <var>node</var>, set its <a for=range>start</a> to
+ (<var>parent</var>, <var>index</var>).
+
+ <li><p>For each <a>live range</a> whose <a for=range>end node</a> is an <a>inclusive descendant</a>
+ of <var>node</var>, set its <a for=range>end</a> to (<var>parent</var>, <var>index</var>).
+
+ <li><p>For each <a>live range</a> whose <a for=range>start node</a> is <var>parent</var> and
+ <a for=range>start offset</a> is greater than <var>index</var>, decrease its
+ <a for=range>start offset</a> by 1.
 
  <li><p>For each <a>live range</a> whose <a for=range>end node</a> is <var>parent</var> and
  <a for=range>end offset</a> is greater than <var>index</var>, decrease its