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+---
+title: WindowEventHandlers.onmessage
+slug: Web/API/WindowEventHandlers/onmessage
+tags:
+  - API
+  - Event Handler
+  - HTML DOM
+  - Property
+  - Reference
+  - Window
+  - WindowEventHandlers
+  - events
+  - onmessage
+translation_of: Web/API/WindowEventHandlers/onmessage
+---
+<div>{{APIRef("HTML DOM")}}{{ SeeCompatTable() }}</div>
+
+<p>{{domxref("WindowEventHandlers")}} ミックスインの <strong><code>onmessage</code></strong> プロパティは、オブジェクトが {{event("message")}} イベントを受け取るたびに呼び出される {{domxref("EventHandler")}} です。</p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox">window.addEventListener('message', function(event) { ... })
+window.onmessage = function(event) { ... }</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','#handler-window-onmessage','onmessage')}}</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>
+
+<div>
+
+
+<p>{{Compat("api.WindowEventHandlers.onmessage")}}</p>
+</div>