float的设计初衷仅仅是:为了文字环绕效果
float的包裹与破坏
包裹:收缩、坚挺、隔绝(BFC)
破坏:父元素高度塌陷
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <title>Layout</title> <style> .box{ border: 1px solid red; width: 300px; margin: 20px auto; } .left{ float: left; height: 100px; width: 50px; border: 1px solid black; } .right{ float: right; height: 100px; width: 50px; border: 1px solid green; } </style> </head> <body> <div class="box"> <div class="left"></div> <div class="right"></div> </div> </body> </html>