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+---
+title: MouseEvent.clientX
+slug: Web/API/MouseEvent/clientX
+translation_of: Web/API/MouseEvent/clientX
+---
+<p>{{APIRef("DOM Events")}}</p>
+
+<p><strong><code>MouseEvent.clientX</code></strong> は event の起きた点の、クライアント内での X 座標を参照できる読み取り専用の属性です。画面の左上でクリックした場合、ページの横スクロール位置に関わらず、その値は 0 となります。</p>
+
+<h2 id="記法">記法</h2>
+
+<pre class="syntaxbox">var <em>x</em> = <em>instanceOfMouseEvent</em>.clientX
+</pre>
+
+<h3 id="返り値">返り値</h3>
+
+<p>数値</p>
+
+<h2 id="Example" name="Example">使用例</h2>
+
+<pre class="brush:html">&lt;!DOCTYPE html&gt;
+&lt;html&gt;
+&lt;head&gt;
+&lt;title&gt;clientX\clientY example&lt;/title&gt;
+
+&lt;script&gt;
+function showCoords(evt){
+  alert(
+    "clientX value: " + evt.clientX + "\n" +
+    "clientY value: " + evt.clientY + "\n"
+  );
+}
+&lt;/script&gt;
+&lt;/head&gt;
+
+&lt;body onmousedown="showCoords(event)"&gt;
+&lt;p&gt;To display the mouse coordinates click anywhere on the page.&lt;/p&gt;
+&lt;/body&gt;
+&lt;/html&gt;
+</pre>
+
+<h2 id="仕様">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('DOM3 Events','#widl-MouseEvent-clientX','MouseEvent.clientX')}}</td>
+   <td>{{Spec2('DOM3 Events')}}</td>
+   <td>{{SpecName('DOM2 Events')}} からの変更はなし</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM2 Events','#Events-MouseEvent','MouseEvent.clientX')}}</td>
+   <td>{{Spec2('DOM2 Events')}}</td>
+   <td>最初の定義</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザ互換性</h2>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>機能</th>
+   <th>Firefox (Gecko)</th>
+   <th>Chrome</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>基本サポート</td>
+   <td>{{CompatVersionUnknown()}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+   <td>6</td>
+   <td>{{CompatVersionUnknown()}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>機能</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Android</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>基本サポート</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>{{ domxref("MouseEvent") }}</li>
+ <li>{{domxref("event.clientY","clientY")}}</li>
+ <li>{{domxref("event.screenX","screenX")}} / {{domxref("event.screenY","screenY")}}</li>
+</ul>