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4</title><!--絕對位置: 若有父級元素有relative，就以該父級元素為定位參照體。--><style type="text/css">body {margin:20px;padding:0;}.c1 {width:700px;height:100px;background-color:red;}.c2 {margin:10px;width:700px;height:100px;background-color:green;position:relative;}.c3 {background-color:orange;position:absolute;top:30px;left:30px;}.c4 {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 class="c3">第三個塊地區</div></div><div class="c4">第四個塊地區</div></body></html>
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