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火狐支持的改变滚动条的CSS属性有两个：1、scrollbar-color属性，用于设置元素滚动条的颜色，可控制滚动条轨道和滚动条拇指的颜色，语法“scrollbar-color:color|dark|light;”；2、scrollbar-width属性，用于设置显示时元素滚动条的宽度或厚度，语法“scrollbar-width:thin|none|宽度大小值;”。
本教程操作环境：windows7系统、CSS3&&HTML5版、Dell G3电脑。
修改火狐滚动条样式的css属性只有 scrollbar-color 和 scrollbar-width 。
scrollbar-color属性
scrollbar-color属性用于设置元素滚动条的颜色。它可用于分别控制滚动条轨道和滚动条拇指的颜色。滚动条的轨迹是滚动条的背景，它保持固定并显示可以滚动的区域。滚动条的拇指指的是滚动条的移动部分，该部分浮点数在轨道的顶部，表示滚动条的当前位置。
track（轨道）是指滚动条，其一般是固定的而不管滚动位置的背景。
thumb（拇指）是指滚动条通常漂浮在轨道的顶部上的移动部分。
语法：
scrollbar-color:auto | color | dark | lightauto | 在没有任何其他相关滚动条颜色属性的情况下，滚动条的轨道部分默认平台渲染。 |
dark | 显示黑色滚动条，可以是平台提供的滚动条的深色变体，也可以是带深色的自定义滚动条。 |
light | 显示一个轻量滚动条，可以是平台提供的滚动条的轻微变体，也可以是带有浅色的自定义滚动条。 |
<color> <color> | 将第一种颜色应用于滚动条拇指，第二种颜色应用于滚动条轨道。 |
scrollbar-color: auto;
scrollbar-color: dark;
scrollbar-color: light;
scrollbar-color: red #00f; 示例：
<!DOCTYPE html>
<html>
<head>
<title>
CSS | scrollbar-color </title>
<style>
.scrollbar-auto {
scrollbar-color:auto;
height:150px;
width:200px;
overflow-y:scroll;
background-color:lightgreen;
}
</style>
</head>
<body>
<h2 style="color:green">
GeeksforGeeks </h2>
<b>
CSS | scrollbar-color </b>
<p>
The container below has scrollbar-color set to
'auto'.
</p>
<div class="scrollbar-auto">
GeeksforGeeks is a computer science portal with a huge variety of well written and explained computer science and programming articles, quizzes and interview questions. The portal also has dedicated GATE preparation and competitive programming sections.
</div>
</body>
</html>
<!DOCTYPE html>
<html>
<head>
<title>
CSS | scrollbar-color </title>
<style>
.scrollbar-colored {
scrollbar-color:red green;
height:150px;
width:200px;
overflow-y:scroll;
background-color:lightgreen;
}
</style>
</head>
<body>
<h2 style="color:green">
GeeksforGeeks </h2>
<b>
CSS | scrollbar-color </b>
<p>
The container below has a red green scrollbar-color.
</p>
<div class="scrollbar-colored">
GeeksforGeeks is a computer science portal with a huge variety of well written and explained computer science and programming articles, quizzes and interview questions. The portal also has dedicated GATE preparation and competitive programming sections.
</div>
</body>
</html>
scrollbar-width属性
scrollbar-width 属性允许开发者设置滚动条出现时的厚度
scrollbar-width属性用于设置显示时元素滚动条的宽度或厚度。此属性可用于以下页面上：用户接口要求元素应更突出地显示，并且缩小滚动条宽度可为元素提供更多空间。
语法：
scrollbar-width:auto | thin | none |len用法：
scrollbar-width: auto;
scrollbar-width: thin;
scrollbar-width: none;
scrollbar-width: 66px; 属性值：
auto:它用于设置滚动条宽度，以由浏览器自动设置。它是默认值。
<!DOCTYPE html>
<html>
<head>
<title>CSS | scrollbar-width property</title>
<style>
.scrollbar-auto {
scrollbar-width:auto;
background-color:lightgreen;
height:150px;
width:200px;
overflow-y:scroll;
}
</style>
</head>
<body>
<h2 style="color:green">
GeeksforGeeks </h2>
<b>CSS | scrollbar-width</b>
<p>scrollbar-width:auto</p>
<div class="scrollbar-auto">
GeeksforGeeks is a computer science portal with a huge variety of well written and explained computer science and programming articles, quizzes and interview questions. The portal also
has dedicated GATE preparation and competitive programming sections.
</div>
</body>
</html>
thin:用于将滚动条的宽度设置为默认滚动条的更薄的变体。
<!DOCTYPE html>
<html>
<head>
<title>CSS | scrollbar-width</title>
<style>
.scrollbar-thin {
scrollbar-width:thin;
background-color:lightgreen;
height:150px;
width:200px;
overflow-y:scroll;
}
</style>
</head>
<body>
<h2 style="color:green">
GeeksforGeeks </h2>
<b>CSS | scrollbar-width</b>
<p>scrollbar-width:thin</p>
<div class="scrollbar-thin">
GeeksforGeeks is a computer science portal with a huge variety of well written and explained computer science and programming articles, quizzes and interview questions. The portal also
has dedicated GATE preparation and competitive programming sections.
</div>
</body>
</html>
none:它用于完全隐藏滚动条，但是内容仍可滚动。
<!DOCTYPE html>
<html>
<head>
<title>CSS | scrollbar-width</title>
<style>
.scrollbar-none {
scrollbar-width:none;
background-color:lightgreen;
height:150px;
width:200px;
overflow-y:scroll;
}
</style>
</head>
<body>
<h2 style="color:green">
GeeksforGeeks </h2>
<b>CSS | scrollbar-width</b>
<p>scrollbar-width:none</p>
<div class="scrollbar-none">
GeeksforGeeks is a computer science portal with a huge variety of well written and explained computer science and programming articles, quizzes and interview questions. The portal also
has dedicated GATE preparation and competitive programming sections.
</div>
</body>
</html>
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