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CSS 定位 relative && absolute 问题？
谁能解释一下，为什么div使用 relative是设置right,bottom 后，看不到div 呀，哪里多出来的 top , left 属性负值呀？
（已测试了所有最新的浏览器，自动添加的top , left 属性负值）
demo:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>CSS 定位：relative && absolute</title> <style> *{ margin: 0; padding: 0; } html,body{ 100%; height: 100%; background: rgba(0,0,0,0.3); color: red; box-sizing: border-box; overflow: hidden; } .relative{ background-color: #f0f; 100px; height: 100px; position: relative; right: 100px; bottom: 100px; /* position: relative; 浏览器，自动补全 : left == -right; top == -bottom; */ } </style> </head> <body> <div class="box"> <div class="relative"> <!--comments--> </div> </div> </body> </html>1.
2. chrome 中修改后，
3. 同样，设置 left,top 后， 多出来 right/bottom 的负值属性？
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demo:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>CSS 定位：relative && absolute</title> <style> *{ margin: 0; padding: 0; } html,body{ 100%; height: 100%; background: rgba(0,0,0,0.3); color: red; box-sizing: border-box; overflow: hidden; } .box{ 1000px; height: 600px; border: 1px solid red; /*overflow: hidden;*/ } .box .relative{ background-color: #f0f; 100px; height: 100px; position: relative; right: 50px; bottom: 50px; /* position: relative; 浏览器，自动补全 : left == -right; top == -bottom; */ } .box .relative-new{ background-color: #0f0; 100px; height: 100px; position: relative; right: 0; bottom: 0; } </style> </head> <body> <div class="box"> <div class="relative"> <h3>relative</h3> </div> <div class="relative-new"> <h3>relative-new</h3> </div> </div> </body> </html>
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demo:
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>CSS 定位：relative && absolute</title> <style> *{ margin: 0; padding: 0; } html,body{ 100%; height: 100%; background: rgba(0,0,0,0.3); color: red; box-sizing: border-box; overflow: hidden; } .box{ 1000px; height: 600px; border: 1px solid red; /*overflow: hidden;*/ } .box .relative{ background-color: #0f0; 100px; height: 100px; position: relative; right: 100px; bottom: 100px; /* */ } .box .relative-new{ background-color: #0f0; 100px; height: 100px; position: relative; left: 100px; top: 100px; } .box .absolute{ background-color: #0f0; 100px; height: 100px; position: absolute; right: 100px; bottom: 100px; /* position:absolute; right: 200px; bottom: 200px; 这样才好使！ //position:absolute; float脱离文档流 */ } </style> </head> <body> <div class="box"> <div class="relative"> <h3>relative</h3> </div> <div class="relative-new"> <h3>relative-new</h3> </div> <div class="absolute"> <h3>absolute</h3> </div> </div> </body> </html>
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