次の HTML コードがあります。
<!DOCTYPE html>
<html>
<head>
<title>Contest Coding</title>
<meta charset = 'utf-8'>
<meta name = 'description' content = 'The free programming competition for everyone'>
<meta name = 'keywords' content = 'programming competition, coding competition, programming contest, coding contest, progrramming puzzles, coding puzzles, contestcoding, contest coding, c, c#, c++, python, ruby, java, javascript, php, haskell, perl, programming, coding'>
<meta name = 'author' content = 'Lewis Cornwall'>
<style type = 'text/css'>
body {
margin: auto;
width: 960px;
font-family: Helvetica, sans-serif;
font-size: 16px;
}
#header {
text-align: center;
}
#leaderboard {
float: left;
}
#leaderboard table {
width: 280px;
}
#puzzles {
float: right;
}
#puzzles table {
width: 640px;
}
.view_full {
line-height: 2em;
}
h1 {
font-size: 60px;
line-height: .5em;
}
table {
border-collapse: collapse;
background-color: lightgrey;
}
table, th, td {
padding: 10px;
border: 1px solid #000;
text-align: left;
}
a {
color: #000;
text-decoration: none;
}
a:hover {
text-decoration: underline;
}
</style>
</head>
<body>
<div id = 'header'>
<h1>CONTEST CODING</h1>
<p>The free programming competition for everyone</p>
</div>
<div id = 'leaderboard'>
<h2>Leaderboard</h2>
<table>
<thead>
<tr>
<th>Name</th>
<th>Points</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<a href = ''>Ed Southall</a>
</td>
<td>20</td>
</tr>
<tr>
<td>
<a href = ''>Mark Bishop</a>
</td>
<td>20</td>
</tr>
<tr>
<td>
<a href = ''>Krishna Teja</a>
</td>
<td>18</td>
</tr>
</tbody>
</table>
<a href = '' class = 'view_full'>View full leaderboard »</a>
</div>
<div id = 'puzzles'>
<h2>Latest Puzzles</h2>
<table>
<thead>
<tr>
<th>Name</th>
<th>Solved By</th>
</tr>
</thead>
<tbody>
<tr>
<td>
<a href = ''>The Truck Driver - Click to View and Solve</a>
</td>
<td>0</td>
</tr>
<tr>
<td>
<a href = ''>The Eight Queens - Click to View and Solve</a>
</td>
<td>0</td>
</tr>
<tr>
<td>
<a href = ''>Palindromic Primes - Click to View and Solve</a>
</td>
<td>3</td>
</tr>
</tbody>
</table>
<a href = '' class = 'view_full'>View all puzzles »</a>
</div>
</body>
</html>
Google Chromeで実行しました。右クリックして「要素の検査」を選択し、本文セクションをクリックしましたが(Chromeは本文全体を強調表示する必要があります)、セクションのみを強調表示しました#header
。ページ全体が強調表示されないのはなぜですか?