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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>
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