原文：http://blog.csdn.net/huang_xw/article/details/7300201
<!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"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>實驗2</title><!--絕對位置：a)不在文檔流中。b)沒有top與left時，定位的參照體是文檔流中的位置。--><style type="text/css">body{margin:0;text-align:center;}.c1 {width:700px;height:100px;background-color:red;}.c2 {width:700px;height:100px;background-color:green;}.c3 {margin:40px;background-color:orange;position:absolute;}.c4 {margin:20px;width:700px;height:100px;background-color:blue;}</style></head><body><div class="c1">第一個塊地區</div><div class="c2">第二個塊地區</div><div class="c3">第三個塊地區</div><div class="c4">第四個塊地區</div></body></html>
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