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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{
width: 100%;
height: 100%;
background: rgba(0,0,0,0.3);
color: red;
box-sizing: border-box;
overflow: hidden;
}
.relative{
background-color: #f0f;
width: 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{
width: 100%;
height: 100%;
background: rgba(0,0,0,0.3);
color: red;
box-sizing: border-box;
overflow: hidden;
}
.box{
width: 1000px;
height: 600px;
border: 1px solid red;
/*overflow: hidden;*/
}
.box .relative{
background-color: #f0f;
width: 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;
width: 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>
1
demo:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>CSS 定位：relative && absolute</title>
<style>
*{
margin: 0;
padding: 0;
}
html,body{
width: 100%;
height: 100%;
background: rgba(0,0,0,0.3);
color: red;
box-sizing: border-box;
overflow: hidden;
}
.box{
width: 1000px;
height: 600px;
border: 1px solid red;
/*overflow: hidden;*/
}
.box .relative{
background-color: #0f0;
width: 100px;
height: 100px;
position: relative;
right: 100px;
bottom: 100px;
/*
*/
}
.box .relative-new{
background-color: #0f0;
width: 100px;
height: 100px;
position: relative;
left: 100px;
top: 100px;
}
.box .absolute{
background-color: #0f0;
width: 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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