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@@ -126130,20 +126130,21 @@ document.body.appendChild(text);
  attribute, then let <var>declarative shadow delegates focus</var> be true. Otherwise let
  it be false.</p></li>
 
- <li><p>If <var>declarative shadow host element</var> is not a <span>shadow host</span>,
- then <span data-x="concept-attach-a-shadow-root">attach a shadow root</span> with
- <var>declarative shadow host element</var>, <var>declarative shadow mode</var>, true,
- <var>declarative shadow delegates focus</var>, and "<code data-x="">named</code>".
- If an exception is thrown, then catch it and <span>report the exception</span>.</p></li>
-
- <li><p>If an exception was thrown by <span data-x="concept-attach-a-shadow-root">attach a
- shadow root</span>, or if <var>declarative shadow host element</var> was already a
- <span>shadow host</span>, then
- <span>Insert an element at the adjusted insertion location</span> with
- <var>template</var>.</p></li>
+ <li><p>Let <var>should attach shadow root</var> be true.</p></li>
+
+ <li><p>If <var>declarative shadow host element</var> is a <span>shadow host</span>, then
+ <span>insert an element at the adjusted insertion location</span> with
+ <var>template</var>, and set <var>should attach shadow root</var> to false.</p></li>
+
+ <li><p>Otherwise, <span data-x="concept-attach-a-shadow-root">attach a shadow root</span>
+ with <var>declarative shadow host element</var>, <var>declarative shadow mode</var>,
+ true, <var>declarative shadow delegates focus</var>, and "<code data-x="">named</code>".
+ If an exception is thrown, then catch it, <span>report the exception</span>,
+ <span>insert an element at the adjusted insertion location</span> with
+ <var>template</var>, and set <var>should attach shadow root</var> to false.</p></li>
 
  <li>
- <p>Otherwise:</p>
+ <p>If <var>should attach shadow root</var>, then:</p>
 
  <ol>
  <li><p>Let <var>shadow</var> be <var>declarative shadow host element</var>'s