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天蓬老师Correction status：qualified
Teacher's comments：就是计算方式不同而已
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<!DOCTYPE html><html lang="en"><head><meta charset="UTF-8" /><meta name="viewport" content="width=device-width, initial-scale=1.0" /><title>box-sizing的意义</title></head><style>.box1 {width: 200px;height: 200px;padding: 20px;margin: auto;box-sizing: content-box;background-color: darkslateblue;}.box2 {width: 200px;height: 200px;padding: 20px;margin: auto;box-sizing: border-box;background-color: rgb(169, 167, 187);}</style><body><div class="box1"></div><div class="box2"></div></body></html>
二者区别效果图：