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deep20.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Visibility and z-index</title>
<style>
.box{
width:170px;
height:170px;
border:2px solid black;
}
#box1{
position:relative;
top:4px;
/* z-index:34px; */
background-color: green;}
#box2{
position:relative;
top:1px;
/* z-index:4px; */
/* z-index: ;will work only for position relative,absolute,fixed or sticky */
/* display: none; */
/* will hide the element and the space */
/* visibility: visible; */
/* will show the element and show the space */
/* visibility:hidden; */
/* will hide the element but show the space */
background-color: red;}
#box3{background-color: blue;}
#box4{background-color: yellow;}
</style>
</head>
<body>
<!-- in body i typed div.box#box$*4 first -->
<div class="box" id="box1">
</div>
<div class="box" id="box2"></div>
<div class="box" id="box3"></div>
<div class="box" id="box4"></div>
</body>
</html>