▼label要素の次に兄弟要素のinput要素に赤枠を付けます。
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="ja" lang="ja"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="Content-Language" content="ja" /> <meta http-equiv="Content-Script-Type" content="text/javascript" /> <meta http-equiv="Content-Style-Type" content="text/css" /> <meta http-equiv="imagetoolbar" content="no" /> <title>DOM要素:階層構造:prev + nextの使用例 | jQuery</title> <link rel="stylesheet" type="text/css" href="/content/lib/global.css" /> <!-- JS --> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js"></script> <script type="text/javascript"> $(function(){ $("label + input").css("border","1px solid red"); }); </script> <style type="text/css"> form div { width:90px; height:90px; margin:5px; float:left; background:#bbf; font-weight:bold; } form fieldset { margin:1em 0; padding:10px; } label { font-weight:bold; } </style> <link rel="stylesheet" type="text/css" href="/common/css/example.css"></head> <body id='example3' class='example'><div class="ads" style="margin:32px auto;text-align:center;"></div><h1 class='h'><a href='/'>PHP & JavaScript Room</a> :: 設置サンプル</h1> <h3 class='h'>実行結果</h3> <div id="wrap"> <h1>DOM要素:階層構造:prev + nextの使用例 | jQuery</h1> <p>▼label要素の次に兄弟要素のinput要素に赤枠を付けます。</p> <!-- CODE --> <form action="#"> <label>ラベル:</label><input name="name" /> <fieldset> <label>ラベル:</label><input name="newsletter" /> </fieldset> </form> <input name="none" value="ラベルなし" /> <!-- CODE / --> </div> </body> </html>