CSS border-top-width Property
Demo
CSS border-top-width Property
CSS border-top-width property sets the width of the top border of an element.
Example
<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
div{
border: 1px solid black;
border-top-width: 5px;
}
</style>
</head>
<body>
<h1>CSS border-top-width Property</h1>
<div>
This is div container.
</div>
</body>
</html>
Syntax
Using CSS
element{
border-top-width: 5px;
}
Using Javascript
object.style.borderTopWidth="5px";
Animatable
Yes, border-top-width property is animatable. CSS Animatable Properties Reference.
Default Value
Default value for CSS border-top-width property is medium.
Property Value
The following table provides a list of all values for CSS border-top-width property.
| Value | Explanation |
|---|
| thin | Specifies a thin border. |
| medium | Specifies a medium border. |
| thick | Specifies a thick border. |
| length | Allows you to define the thickness of the border in any CSS length unit. |
All in One
In the following example, we will demonstrate all values of CSS border-top-width property.
Example
<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
div{
border-style: solid;
}
#point{
border-top-width: thin;
}
#point1{
border-top-width: medium;
}
#point2{
border-top-width: thick;
}
#point3{
border-top-width: 5px;
}
</style>
</head>
<body>
<h1>CSS border-top-width Property</h1>
<h2>border-top-width: thin;</h2>
<div id="point">
This is div container.
</div>
<h2>border-top-width: medium;</h2>
<div id="point1">
This is div container.
</div>
<h2>border-top-width: thick;</h2>
<div id="point2">
This is div container.
</div>
<h2>border-top-width: 5px;</h2>
<div id="point3">
This is div container.
</div>
</body>
</html>
Using JavaScript
In the following example, we will demonstrate how to change the CSS border-top-width property of an element using JavaScript.
Example
<!DOCTYPE html>
<html lang="en-US">
<head>
<style>
div{
padding: 10px;
margin-bottom: 10px;
border-style: dotted;
border-top-width: 1px;
}
</style>
</head>
<body>
<h1>CSS border-top-width Property</h1>
<div>
This is div container.
</div>
<button onclick="myFunction()">Click Me</button>
<script>
var x = document.getElementsByTagName("div")[0];
function myFunction(){
x.style.borderTopWidth = "5px";
}
</script>
</body>
</html>
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