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+<header><h1>is</h1></header><div class="section-content">
+<p>The <code>is</code> <a href="../global_attributes">global attribute</a> allows you to specify that a standard HTML element should behave like a defined custom built-in element (see <a href="https://developer.mozilla.org/en-US/docs/Web/API/Web_components/Using_custom_elements">Using custom elements</a> for more details).</p> <p>This attribute can only be used if the specified custom element name has been successfully <a href="https://developer.mozilla.org/en-US/docs/Web/API/CustomElementRegistry/define">defined</a> in the current document, and extends the element type it is being applied to.</p>
+</div>
+<h2 id="examples">Examples</h2>
+<div class="section-content">
+<p>The following code is taken from our <a href="https://github.com/mdn/web-components-examples/tree/main/word-count-web-component" target="_blank">word-count-web-component</a> example (<a href="https://mdn.github.io/web-components-examples/word-count-web-component/" target="_blank">see it live also</a>).</p> <div class="code-example">
+<p class="example-header"><span class="language-name">js</span></p>
+<pre data-signature="jVc95/umnT02cy/WQ+QXP/GX79Q/NzKV4VzHQjCaIMo=" data-language="js"><span class="token comment">// Create a class for the element</span>
+<span class="token keyword">class</span> <span class="token class-name">WordCount</span> <span class="token keyword">extends</span> <span class="token class-name">HTMLParagraphElement</span> <span class="token punctuation">{</span>
+  <span class="token function">constructor</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span>
+    <span class="token comment">// Always call super first in constructor</span>
+    <span class="token keyword">super</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
+
+    <span class="token comment">// Constructor contents omitted for brevity</span>
+    <span class="token comment">// …</span>
+  <span class="token punctuation">}</span>
+<span class="token punctuation">}</span>
+
+<span class="token comment">// Define the new element</span>
+customElements<span class="token punctuation">.</span><span class="token function">define</span><span class="token punctuation">(</span><span class="token string">"word-count"</span><span class="token punctuation">,</span> WordCount<span class="token punctuation">,</span> <span class="token punctuation">{</span> <span class="token keyword">extends</span><span class="token operator">:</span> <span class="token string">"p"</span> <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
+</pre>
+</div> <div class="code-example">
+<p class="example-header"><span class="language-name">html</span></p>
+<pre data-signature="2HWc9XXr7N6633Peud0V5KO5Agg7fFBZQXZH96uYCqM=" data-language="html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>p</span> <span class="token attr-name">is</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>word-count<span class="token punctuation">"</span></span><span class="token punctuation">&gt;</span></span><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>p</span><span class="token punctuation">&gt;</span></span>
+</pre>
+</div>
+</div>
+<h2 id="specifications">Specifications</h2>
+<div class="_table"><table class="standard-table">
+<thead><tr><th scope="col">Specification</th></tr></thead>
+<tbody><tr><td><a href="https://html.spec.whatwg.org/multipage/custom-elements.html#attr-is">HTML Standard <br><small># attr-is</small></a></td></tr></tbody>
+</table></div>
+<h2 id="browser_compatibility">Browser compatibility</h2>
+<div class="_table"><table>
+<thead>
+<tr id="bct-browser-type">
+<th></th>
+<th colspan="6">Desktop</th>
+<th colspan="6">Mobile</th>
+</tr>
+<tr id="bct-browsers">
+<th></th>
+<th>Chrome</th>
+<th>Edge</th>
+<th>Firefox</th>
+<th>Internet Explorer</th>
+<th>Opera</th>
+<th>Safari</th>
+<th>WebView Android</th>
+<th>Chrome Android</th>
+<th>Firefox for Android</th>
+<th>Opera Android</th>
+<th>Safari on IOS</th>
+<th>Samsung Internet</th>
+</tr>
+</thead>
+<tbody><tr>
+<th><code>is</code></th>
+<td class="bc-supports-yes">67</td>
+<td class="bc-supports-yes">79</td>
+<td class="bc-supports-yes">63</td>
+<td class="bc-supports-no">No</td>
+<td class="bc-supports-yes">54</td>
+<td class="bc-supports-no">No</td>
+<td class="bc-supports-yes">67</td>
+<td class="bc-supports-yes">67</td>
+<td class="bc-supports-yes">63</td>
+<td class="bc-supports-yes">48</td>
+<td class="bc-supports-no">No</td>
+<td class="bc-supports-yes">9.0</td>
+</tr></tbody>
+</table></div>
+<h2 id="see_also">See also</h2>
+<div class="section-content"><ul> <li>All <a href="../global_attributes">global attributes</a>.</li> </ul></div><div class="_attribution">
+  <p class="_attribution-p">
+    &copy; 2005&ndash;2023 MDN contributors.<br>Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.<br>
+    <a href="https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/is" class="_attribution-link">https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes/is</a>
+  </p>
+</div>