diff --git a/source b/source
index 1af36bbf10f..779010ef73e 100644
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@@ -72050,9 +72050,6 @@ document.body.append(parent);
     }
   }</code></pre>
 
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   <h4 id="custom-elements-core-concepts">Core concepts</h4>
 
   <p>A <dfn export>custom element</dfn> is an element that is <span