From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: MouseEvent.screenX
+slug: Web/API/MouseEvent/screenX
+translation_of: Web/API/MouseEvent/screenX
+---
+<p>{{APIRef("DOM Events")}}</p>
+
+<p><strong><code>MouseEvent.screenX</code></strong> は、イベントの発生した位置の、スクリーン内での X 座標を参照できる読み取り専用の属性です。</p>
+
+<h2 id="記法">記法</h2>
+
+<pre class="syntaxbox">var <em>pixelNumber</em> = <em>instanceOfMouseEvent</em>.screenX
+</pre>
+
+<h3 id="返り値">返り値</h3>
+
+<ul>
+ <li><em><code>pixelNumber</code></em> はスクリーンの左上の点からのピクセル数です。</li>
+</ul>
+
+<h3 id="Example" name="Example">使用例</h3>
+
+<pre class="brush: html">&lt;html&gt;
+&lt;head&gt;
+&lt;title&gt;screenX\screenY example&lt;/title&gt;
+
+&lt;script type="text/javascript"&gt;
+
+function showCoords(evt){
+  alert(
+    "screenX value: " + evt.screenX + "\n"
+    + "screenY value: " + evt.screenY + "\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>
+
+<p>window や document のような領域の広い要素に対してイベントを処理する場合、以下のように座標を元に適切な処理を呼び出すことができます。</p>
+
+<pre class="brush: js">function checkClickMap(e) {
+  if (e.screenX &lt; 50) doRedButton();
+  if (50 &lt;= e.screenX<span style="font-size: 1rem;"> &amp;&amp; </span>e.screenX<span style="font-size: 1rem;"> &lt; 100)</span><span style="font-size: 1rem;"> doYellowButton();
+</span>  if (e.screenX &gt;= 100) doRedButton();
+}
+</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-screenX','MouseEvent.screenX')}}</td>
+   <td>{{Spec2('DOM3 Events')}}</td>
+   <td> {{SpecName('DOM2 Events')}} からの変更なし</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM2 Events','#Events-MouseEvent','MouseEvent.sceenX')}}</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>{{CompatVersionUnknown()}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+   <td>{{CompatVersionUnknown()}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li>{{ domxref("MouseEvent") }}</li>
+</ul>
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