[HTML] Clarify that window.customElements always returns an object whatwg/html@20a7295

Author: triple-underscore

HTML-custom-ja.html

@@ -166,8 +166,8 @@
 
 ●●options
 
-spec_date:2025-04-15
-trans_update:2025-04-16
+spec_date:2025-04-16
+trans_update:2025-04-17
 source_checked:250314
 page_state_key:HTML
 spec_status:LS
@@ -2916,13 +2916,37 @@ <h4 title="The CustomElementRegistry interface">4.13.4. `CustomElementRegistry^I
 </p>
 
 <div class="algo">
+<p>
 `Window$I の
 `customElements@m
-取得子~手続きは
-⇒
-~RET コレ に`結付けられた文書$の`~custom要素~registry$doc
+取得子~手続きは：
+</p>
+<ol>
+	<li>
+%~registry ~LET コレに`結付けられた文書$の`~custom要素~registry$doc
+◎
+↓</li>
+	<li>
+<p>
+~Assert：
+%~registry は `CustomElementRegistry$I ~objである。
+◎
+Assert: this's associated Document's custom element registry is a CustomElementRegistry object.
+</p>
+
+<p class="note">注記：
+`Window$I に`結付けられた文書$は、
+常に，新たな `CustomElementRegistry$I ~objを伴って作成される。
 ◎
-The Window customElements getter steps are to return this's associated Document's custom element registry.
+A Window's associated Document is always created with a new CustomElementRegistry object.
+</p>
+	</li>
+	<li>
+~RET %~registry
+◎
+Return this's associated Document's custom element registry.
+</li>
+</ol>
 </div>
 
 <pre class="idl">