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Why is the z-index style not applied to the <body> element?

The style z-indexallows you to control which order fields are colored. For example, you can create a child below its parent:

#parent {
  background: rgba(33, 33, 33, 0.7);
}
#child {
  width: 100px;
  height: 100px;
  background: yellow;
  position: relative;
  z-index: -1;
}
<div id="parent"><div id="child"></div></div>
Run code

However, when the parent is a tag <body>, it no longer behaves as expected:

body {
  background: rgba(33, 33, 33, 0.7);
}
#child {
  width: 100px;
  height: 100px;
  background: yellow;
  position: relative;
  z-index: -1;
}
<body>
  <div id="child"></div>
</body>
Run code

The CSS specification §9.9.1 states (primary focus):

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html { 
  background-color: white;
}

body {
  background: rgba(33, 33, 33, 0.7);
}
#child {
  width: 100px;
  height: 100px;
  background: yellow;
  position: relative;
  z-index: -1;
}
<body>
  <div id="child"></div>
</body>
+4

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Tantek Celik:

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Tantek

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< body style = "z-index = 0; background-color = green;" >

< p style = "z-index = -1; position: relative; top: 50; left: 20" > !! </ >
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- ranjit

http://lists.w3.org/Archives/Public/www-style/1999Aug/0131.html

+1

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0

The <body>default tag remains at the bottom of the stack. It simply cannot be installed, as it will always be the smallest possible value.

Source: Adobe Forums

-one
source

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