<html> <head> <title>課題3</title> <style type="text/css"> <!-- div#box { background-color: yellow; } --> </style> </head> <body> <h1>課題3</h1> <p>鎌倉幕府は<span class="check">1192</span>年、</p> <script type="text/javascript"> </script> </p> </body> </html>