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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>CSS中box-sizing属性演示,CSS中元素距中方式</title><style>* {margin: 0;padding: 0;}h2 {/* 行内元素和文本距中用text-align:center */text-align: center;border: 1px solid red;margin: 1em;}p {/* P元素设置了行高 */height: 2.5em;text-align: center;font-size: 1.5em;border: 1px solid red;margin: 1em;}span {/* P元素下的子元素,要垂直距中,行高要设置和父元素P一样的高度 */line-height: 2.5em;}div {width: 200px;height: 200px;border: 5px solid red;background-color: sandybrown;}body div:first-of-type {/* 块元素距中用 margin: 0 auto,意为将左或设置为自动,两边自动挤压后距中 */margin: 1em auto;box-sizing: content-box;}body div:first-of-type + div {margin: 1em auto;box-sizing: border-box;}</style></head><body><h2>box-sizing属性说明</h2><p><span>box-sizing属性</span></p><div>此box宽200,高200,box-sizing=content-box时,盒子大小为:boder+padding+width</div><div>box-sizing=border-box时,盒子大小为:width(盒子自身大小)</div></body></html>
