关于a:visited背景图片的问题
这是一个《精通CSS》书里的一个例子，代码：
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>Visited Links</title><style type="text/css"><!--/* pretty stuff================================== */body { font-family: "Myriad Pro", Frutiger, "Lucida Grande", "Lucida Sans", "Lucida Sans Unicode", Verdana, sans-serif; font-size: 1em;}/* visited links================================== */ul { list-style:none;}li { margin: 5px 0;}li a { display: block; width: 300px; height: 30px; line-height: 30px; color: #000; text-decoration: none; background: #94B8E9 url(images/visited.gif) no-repeat left top; text-indent: 10px;}li a:visited { background-position: right top;}--></style></head><body><ul><li><a href="http://www.andybudd.com/">Andy Budd's Blogography</a></li><li><a href="http://www.stuffandnonsense.co.uk/">Stuff and Nonsense</a></li><li><a href="http://www.hicksdesign.co.uk/journal/">Hicks Design</a></li><li><a href="http://www.clagnut.com/">Clagnut</a></li><li><a href="http://www.htmldog.com/">HTML Dog</a></li><li><a href="http://adactio.com/journal/">Adactio</a></li><li><a href="http://www.allinthehead.com/">All In The Head</a></li><li><a href="http://www.markboulton.co.uk/journal/">Mark Boulton</a></li><li><a href="http://www.ian-lloyd.com/">Ian Lloyd</a></li></ul></body></html>