Why does line-height not work under ie8_html/css

Why does line-height not work under ie8_html/css_WEB-ITnose

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Release： 2016-06-24 12:26:11

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>无标题文档</title><style>body {    font: 12px/24px Helvetica,Tahoma,Arial,sans-serif;    	margin: 0;    padding:0;}div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, form, input, textarea, p {    margin: 0;    padding: 0;}img {    border: 0 none;   }*{	margin:0;	padding:0;	}li{    list-style:none;}.fl{	float:left;	display:inline;	}.fr{	float:right;	display:inline;	}a{    text-decoration:none;   color:#313131;}a:hover{    text-decoration:none;}.a_d{	height:22px;	padding:0 10px 0 5px;	border:1px solid #9dabb6;	border-radius:3px;	line-height:22px;	display:inline-block;	background:-webkit-gradient(linear, 0 0, 0 100%, from(#ffffff), to(#e7f0f9));	background:-moz-linear-gradient(top, #ffffff,#e7f0f9);	filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#ffffff,endColorstr=#e7f0f9,grandientType=1);	margin:100px 100px;	}</style></head><body><a class="a_d" href="#">保存</a></body></html>在ie8下 line-height没有垂直居中是怎么回事啊

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It’s okay not to set line-height. If you have to set it, just include the edge

line -Height is okay if you don’t set it. If you have to set it, just include the edges

If you don’t set it, it will be incompatible with Firefox. Is there any way to make it compatible with IE, Firefox and Google?

line-height It’s okay not to set it. If you have to set it, just include the border

It won’t be compatible if you don’t set up Firefox. Is there a way to make it compatible with IE, Firefox and Google?
line-height:24px
Add the border The width is counted

It’s okay if line-height is not set. If you have to set it, the edge is also counted

If you don’t set it, it will not be compatible with Firefox. Do you have IE Firefox or Google? The compatible way is
line-height:24px
Count the width of the border

Count the border line. Firefox is not compatible. I have tried it. Firefox has two more pixels

It’s okay if you don’t set line-height. If you have to set it, just include the edges

It won’t be compatible if you don’t set it for Firefox. Is there a way to make it compatible with IE, Firefox and Google? Ah
line-height:24px
Count the width of the border line

Count the border line. Firefox is not compatible. I have tried it. Firefox has two more pixels
body {
font: 12px/24px sans-serif;
margin: 0;
padding:0;
}
It seems to be a font problem, just delete the first few and it will be fine