老师同学，为什么绝对定位，top:0px 实际PS测量多了3PX？谢谢

Question

老师同学，为什么绝对定位，top:0px  实际PS测量多了3PX？谢谢

Answer 1

To make a digression, if the value is 0, it is strongly recommended not to add the unit px

Answer 2

Teacher and classmates, why is absolute positioning, top:0px, the actual PS measurement 3PX more? Thank you - PHP Chinese website Q&A - Teachers and classmates, why is absolute positioning, top:0px, the actual PS measurement 3PX more? Thank you - PHP Chinese website Q&A

Take a look and learn.

Answer 3

最好直接贴代码，不要截图。加  

box-sizing:border-box;

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