▼ID名が「main」(黄色い部分)の要素の子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:parent > child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(){ $("#main > *").css("border","2px dotted red"); }); </script> <style type="text/css"> #main { display:block; background:yellow; padding:10px; overflow:hidden; } #main button { display:block; float:left; margin:2px; font-size:14px; } #main div { width:90px; height:90px; margin:5px; float:left; background:#bbf; font-weight:bold; } #main div.mini { width:30px; height:30px; background:green; } </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:parent > childの使用例 | jQuery</h1> <p>▼ID名が「main」(黄色い部分)の要素の子要素に赤枠を付けます。</p> <!-- CODE --> <span id="main"> <div></div> <button>Child</button> <div class="mini"></div> <div> <div class="mini"></div> <div class="mini"></div> </div> <div><button>Grand</button></div> <div><span>A Span <em>in</em> child</span></div> <span>A Span in main</span> </span> <!-- CODE / --> </div> </body> </html>