具体标签转换操作如下：
<!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>Document</title>
<style>
.box{
width: 300px;
height: 300px;
background-color: blueviolet;
display: inline-block;
}
.box02{
background-color: yellowgreen;
display: inline;
width: 500px;
height: 500px;
/* 宽高设置无效 */
}
</style>
</head>
<body>
<!-- 行内转块 -->
<div>
<span style="width: 300px; height: 300px; background-color: aquamarine; display: block;">123</span>
</div>
<!-- 行内转块 设置宽高，不换行 -->
<div class="box">
<span>1</span>
<span>2</span>
</div>
<!-- 了解内容：块转行内 -->
<div class="box02">
<div>111</div>
<div>222</div>
<div>333</div>
</div>
</body>
</html>