代码编辑器：
x
1
2
<style>3
p.hometown4
{ 5
background:yellow;6
}7
</style>8
<p>My name is Donald.</p>9
<p class="hometown">I live in Ducksburg.</p>10
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<p>My name is Dolly.</p>12
<p class="hometown">I also live in Ducksburg.</p>13
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<footer>简单教程，简单编程<br/>Copyright © 简单教程 www.twle.cn</footer>15