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+---
+title: WindowEventHandlers.onrejectionhandled
+slug: Web/API/WindowEventHandlers/onrejectionhandled
+tags:
+  - API
+  - Event Handler
+  - HTML DOM
+  - JavaScript
+  - Promises
+  - Property
+  - Reference
+  - WindowEventHandlers
+  - events
+  - onrejectionhandled
+translation_of: Web/API/WindowEventHandlers/onrejectionhandled
+---
+<div>{{APIRef}}</div>
+
+<p><span class="seoSummary">{{domxref("WindowEventHandlers")}} ミックスインの <strong><code>onrejectionhandled</code></strong> プロパティは、{{event("rejectionhandled")}} イベントを処理するための {{domxref("EventHandler")}} です。 このイベントは、{{jsxref("Promise")}} が拒否されたときに発生します。</span></p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox">window.addEventListener("rejectionhandled", function(event) { ... });
+window.onrejectionhandled = function(event) { ...};</pre>
+
+<h2 id="Example" name="Example">例</h2>
+
+<pre class="brush: js">window.onrejectionhandled = function(e) {
+  console.log(e.reason);
+}</pre>
+
+<h2 id="Specifications" name="Specifications">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様</th>
+   <th scope="col">状態</th>
+   <th scope="col">コメント</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('HTML WHATWG', 'webappapis.html#handler-window-onrejectionhandled', 'onrejectionhandled')}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td>初期定義</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+
+
+<p>{{Compat("api.WindowEventHandlers.onrejectionhandled")}}</p>