<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>垂直居中对齐问题</title>
<style>
img{
vertical-align: middle; /*让图片与文字中线对齐 top baseline: */
margin: 0 auto; /*让盒子水平居中显示*/
line-height: /*让元素垂直居中*/
text-align:center; /*让文本水平居中*/
}
</style>
</head>
<body>
<div>
<img src="images/icon3.png" alt="">
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</div>
</body>
</html>