diff --git a/dom.bs b/dom.bs
index 6eefb816..ac85d896 100644
--- a/dom.bs
+++ b/dom.bs
@@ -2754,10 +2754,11 @@ within a <var>parent</var>, run these steps:
 </ol>
 
 
-<p><a lt="Other applicable specifications">Specifications</a> may define
-<dfn export id=concept-node-remove-ext>removing steps</dfn> for all or some <a for=/>nodes</a>. The
-algorithm is passed <var ignore>removedNode</var>, and optionally <var ignore>oldParent</var>, as
-indicated in the <a for=/>remove</a> algorithm below.
+<p><a lt="Other applicable specifications">Specifications</a> may define <dfn export
+id=concept-node-remove-ext>removing steps</dfn> and <dfn export
+id=concept-node-before-remove-ext>before removing steps</dfn> for all or some <a for=/>nodes</a>.
+These algorithms are passed <var ignore>removedNode</var>, and optionally <var
+ignore>oldParent</var>, as indicated in the <a for=/>remove</a> algorithm below.
 
 <p>To <dfn export id=concept-node-remove>remove</dfn> a <var>node</var>, with an optional
 <i>suppress observers flag</i>, run these steps:
@@ -2767,6 +2768,12 @@ indicated in the <a for=/>remove</a> algorithm below.
 
  <li><p>Assert: <var>parent</var> is non-null.
 
+ <li><p>Run the <a>before removing steps</a> with <var>node</var> and <var>parent</var>.
+
+ <li><p>For each <a>shadow-including descendant</a> <var>descendant</var> of <var>node</var>, in
+ <a>shadow-including tree order</a>, run the <a>before removing steps</a> with
+ <var>descendant</var>.</p></li>
+
  <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 an