What nobody told you about z-index
The problem with z-index is that many simply do not understand how it works.
Everything described below is in the W3C specification. Unfortunately, not everyone reads it.
Description of the problem:
So, let us have HTML code consisting of 3
.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1 .
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1 .
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1 .
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1-
., 1,
. , , : , , . , , . z-indexz-index.
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: ,, :HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ()
z-index auto
1., 1,
. , , : , , . , , . z-indexz-index.
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: ,, :HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ()
z-index auto
1 -
., 1,
. , , : , , . , , . z-indexz-index.
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: ,, :HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ()
z-index auto
1., 1,
. , , : , , . , , . z-indexz-index.
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: ,, :HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ()
z-index auto
1 -
., 1,
. , , : , , . , , . z-indexz-index.
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: ,, :HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ()
z-index auto
1., 1,
. , , : , , . , , . z-indexz-index.
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: ,, :HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ()
z-index auto
1
.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1 .
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1
.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1
.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1
.
. , , : , , . , , . z-index , 1, z-index .
HTML css .
<div> <span class="red">Red</span> </div> <div> <span class="green">Green</span> </div> <div> <span class="blue">Blue</span> </div>
.red, .green, .blue { position: absolute; } .red { background: red; z-index: 1; } .green { background: green; } .blue { background: blue; }
jsfiddle
: , , :
HTML / z-index /
:
, ( ).
css, :
div:first-child { opacity: .99; }
jsfiddle
, - . ? ? ? !
, .
:
Z-index : , , .. z-index 5 z-index 2, ? .
z-index. , .
HTML , . . , , , , .
z-index , : HTML. ( , , )
( ), . ( « » – , , : , ).
, , z-index . , , z-index z-index, z-index z-index, . , z-index . z-index , . , z-index . , , ?
, . z-index .
HTML . , . , , , z-index .
:
– ( )
z-index auto
1.
. , , : , , . , , . z-index , 1, z-index .
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jsfiddle
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Source: https://habr.com/ru/post/166435/
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