css border-top-color属性定义及用法
In CSS, the border-top-color attribute is used to set the color of the top border of an element. When we need to set the color of the top border separately, we can use this attribute ; If we want to set the width, style, and color of the top border at the same time, we can use the border-top attribute to define these attributes into a statement. The advantage of this is that we can write fewer lines of code and have better readability.
Note: To set the border color, you must set the border style. Because the default border style of the element is transparent, setting the color of the transparent border will not have a display effect, so use the border-top-color attribute. When setting the top border color, you must ensure that the top border style attribute (border-top-style) has been defined before, otherwise the set top border color will not have an effect.
css border-top-color属性语法格式
css syntax format: border-top-color: color_name / hex_number / rgb_number / transparent / inherit; (Example: border-top-color: red;)
JavaScript syntax: object. style.borderTopColor="blue";
css border-top-color属性值说明
color_name: the color represented by the color name (such as: red);
hex_number: the color represented by the hexadecimal value (such as: # ff0000);
rgb_number The color represented by the rgb code (such as: rgb(255,0,0));
transparen: the border color is transparent (default);
inherit: Inherit the border color from the parent element;
Instance
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>css border-top-color属性设置顶部边框颜色笔记</title>
<style type="text/css">
body{background: #ddd;font-size:20px;}
#a,#b,#c{margin-top:10px;width:300px;border-top-style: solid;}
#a{border-top-color:blue;}
#b{border-top-color:#FFF000;}
#c{border-top-color:rgb(255,0,0);}
</style>
</head>
<body>
<div id = "a">使用颜色名称定义边框颜色演示</div>
<div id = "b">使用十六进制值定义边框颜色演示</div>
<div id = "c">使用rgb代码定义边框颜色演示</div>
</body>
</html>Running result
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