*{display:block; margin:0 auto; }为何会输出整个css的代码？？

2023-06-06 07:45 问答作者：PS抠图

<html> <meta charset="UTF-8"> <head> <style> *{ display:block;margin:0 auto; } body{width:900px; height:50px; border:solid 4px gree优艾设计网_平面设计n; } #d2{ width:100%; height:auto; } #d21,#d22,#d23{ width:33%; float:left; border:1px solid red; } select,input{ width:150px; height:auto; } </style> </head> <body> <div id="d2"> <div id="d21"> <select id="id_select"name="s1"> <option>==> please select <==</option> </select> </div> <div id="d22"> <inputtype="button" value="start" onclick="start()"> </div> <div id="d23"> <input type="button" value="stop" onclick="stop()"></div> </div> </body> </html>请看结果