<html><head> <style type="text/css"> *{ padding: 0; margin: 0; }?body :first-child{?position: absolute;left: 200px;width: 100px;height: 100px;top: 200px;background-color: blue;?}? body :empty{?position: absolute;left: 200px;width: 100px;height: 100px;top: 200px;background-color: red;z-index: 50px?}? body :last-child{?position: absolute;left: 200px;width: 100px;height: 100px;top: 200px;background-color: green;?} </style></head><body>? <div>1</div>? <div></div>? <div>2</div></body></html>chrome F12顯示這樣
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