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+---
+title: ValidityState.tooLong
+slug: Web/API/ValidityState/tooLong
+tags:
+  - API
+  - Constraint Validation API
+  - DOM
+  - Property
+  - Reference
+translation_of: Web/API/ValidityState/tooLong
+---
+<p>読み取り専用のプロパティ <strong><code>ValidityState.tooLong</code></strong> は、
+
+
+{{HTMLElement("input")}} や {{HTMLElement("textarea")}} の値が、ユーザーの編集によって、その要素の <code>maxlength</code> 属性で設定された最大コード単位長を超えているかどうかを示します。</p>
+
+<h2 id="Specifications" name="Specifications">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様書</th>
+   <th scope="col">策定状況</th>
+   <th scope="col">コメント</th>
+  </tr>
+  <tr>
+   <td>{{ SpecName('HTML WHATWG', 'constraints.html#dom-validitystate-toolong', 'ValidityState.tooLong') }}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{ SpecName('HTML5.1', '#dom-validitystate-toolong', 'ValidityState.tooLong') }}</td>
+   <td>{{Spec2('HTML5.1')}}</td>
+   <td> </td>
+  </tr>
+  <tr>
+   <td>{{ SpecName('HTML5 W3C', 'forms.html#dom-validitystate-toolong', 'ValidityState.tooLong') }}</td>
+   <td>{{Spec2('HTML5 W3C')}}</td>
+   <td> </td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザー実装状況</h2>
+
+
+
+<p>{{Compat("api.ValidityState.tooLong")}}</p>
+
+<h2 id="See_also" name="See_also">関連情報</h2>
+
+<ul>
+ <li><a href="/ja/docs/Web/HTML/HTML5/Constraint_validation">制約の検証</a></li>
+ <li><a href="/ja/docs/Learn/HTML/Forms/Data_form_validation">フォームデータの検証</a></li>
+</ul>