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문자

语法:

border-top-width:<line-width>

<line-width> = <length> | thin | medium | thick

默认值medium

适用于:所有元素

继承性:无

动画性:是

计算值:绝对长度值,如果border style设置为none或hidden,则计算值为0

相关属性:[ border-width ] || [ border-right-width ] || [ border-bottom-width ] || [ border-left-width ]

取值:

  • <length>:用长度值来定义边框的厚度。不允许负值

  • medium:定义默认厚度的边框。计算值为3px

  • thin:定义比默认厚度细的边框。计算值为1px

  • thick:定义比默认厚度粗的边框。计算值为5px

说明:

设置或检索对象的顶部边框宽度。
  • 对应的脚本特性为borderTopWidth

兼容性:

ValuesIEFirefoxChromeSafariOperaiOS SafariAndroid BrowserAndroid Chrome
Basic Support6.0+2.0+4.0+3.1+3.5+3.2+2.1+18.0+

实例

<!DOCTYPE html>
<html lang="zh-cmn-Hans">
<head>
<meta charset="utf-8" />
<title>border-top-width_CSS参考手册_web前端开发参考手册系列</title>
<meta name="author" content="Joy Du(飘零雾雨), dooyoe@gmail.com, www.doyoe.com" />
<style>
.test {
	padding: 10px;
	border-top-width: 5px;
	border-top-style: solid;
	border-top-color: #000;
}
</style>
</head>
<body>
<div class="test">设置顶部边框宽度为5px</div>
</body>
</html>
		

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