such as title:
after position:absolute is added, the text-align, width, and height of the row-level element span take effect. Why?
Code:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
body {
margin: 0;
}
.box {
margin: 15% auto;
width: 200px;
height: 200px;
box-sizing: border-box;
border: 1px solid darkblue;
}
.text {
/* position display: block; */
position: absolute;
width: 200px;
height: 200px;
text-align: center;
line-height: 200px;
}
</style>
</head>
<body>
<div class="box">
<span class="text">letter</span>
</div>
</body>
</html>