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+---
+title: CustomElementRegistry
+slug: Web/API/CustomElementRegistry
+tags:
+  - API
+  - CustomElementRegistry
+  - Experimental
+  - Interface
+  - Landing
+  - NeedsTranslation
+  - Reference
+  - TopicStub
+  - Web Components
+  - custom elements
+translation_of: Web/API/CustomElementRegistry
+---
+<p>{{DefaultAPISidebar("Web Components")}}</p>
+
+<p><span class="seoSummary">The <strong><code>CustomElementRegistry</code></strong> interface provides methods for registering custom elements and querying registered elements. To get an instance of it, use the {{domxref("window.customElements")}} property. </span></p>
+
+<h2 id="Methods">Methods</h2>
+
+<dl>
+ <dt>{{domxref("CustomElementRegistry.define()")}}</dt>
+ <dd>Defines a new <a href="/en-US/docs/Web/Web_Components/Custom_Elements">custom element</a>.</dd>
+ <dt>{{domxref("CustomElementRegistry.get()")}}</dt>
+ <dd>Returns the constuctor for the named custom element, or <code>undefined</code> if the custom element is not defined.</dd>
+ <dt>{{domxref("CustomElementRegistry.upgrade()")}}</dt>
+ <dd>Upgrades a custom element directly, even before it is connected to its shadow root.</dd>
+ <dt>{{domxref("CustomElementRegistry.whenDefined()")}}</dt>
+ <dd>Returns an empty {{jsxref("Promise", "promise")}} that resolves when a custom element becomes defined with the given name. If such a custom element is already defined, the returned promise is immediately fulfilled.</dd>
+</dl>
+
+<h2 id="Examples">Examples</h2>
+
+<p>The following code is taken from our <a href="https://github.com/mdn/web-components-examples/tree/master/word-count-web-component">word-count-web-component</a> example (<a href="https://mdn.github.io/web-components-examples/word-count-web-component/">see it live also</a>). Note how we use the {{domxref("CustomElementRegistry.define()")}} method to define the custom element after creating its class.</p>
+
+<pre class="brush: js">// Create a class for the element
+class WordCount extends HTMLParagraphElement {
+  constructor() {
+    // Always call super first in constructor
+    super();
+
+    // count words in element's parent element
+    var wcParent = this.parentNode;
+
+    function countWords(node){
+      var text = node.innerText || node.textContent
+      return text.split(/\s+/g).length;
+    }
+
+    var count = 'Words: ' + countWords(wcParent);
+
+    // Create a shadow root
+    var shadow = this.attachShadow({mode: 'open'});
+
+    // Create text node and add word count to it
+    var text = document.createElement('span');
+    text.textContent = count;
+
+    // Append it to the shadow root
+    shadow.appendChild(text);
+
+
+    // Update count when element content changes
+    setInterval(function() {
+      var count = 'Words: ' + countWords(wcParent);
+      text.textContent = count;
+    }, 200)
+
+  }
+}
+
+// Define the new element
+customElements.define('word-count', WordCount, { extends: 'p' });</pre>
+
+<div class="note">
+<p>Note: The CustomElementRegistry is available through the {{domxref("Window.customElements")}} property.</p>
+</div>
+
+<h2 id="Specifications">Specifications</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</th>
+  </tr>
+  <tr>
+   <td>{{SpecName("HTML WHATWG", "custom-elements.html#customelementregistry", "CustomElementRegistry")}}</td>
+   <td>{{Spec2("HTML WHATWG")}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<p> </p>
+
+
+
+<p>{{Compat("api.CustomElementRegistry")}}</p>
+
+<p> </p>