CSS border-width Property

CSS border-width property sets the widths of all four sides of an element's border. It is a shorthand property which specifies:

This property has four values. When one value is used, the border-width value will apply to all four sides of the element (i.e. top, right, bottom, left). If two values are used, the first value will apply to the top and bottom of the element. The second value will apply to the left and right sides of the element. If three values are used, the first value will apply to the top of the element. The second value will apply to the right and left sides of the element. The third value will apply to the bottom of the element. When four values are used, the first value will apply to the top of the element. The second value will apply to the right side of the element. The third value will apply to the bottom of the element. The fourth value will apply to the left side of the element.

Firstly you should define border-style property then the border-width property. An element must have borders before you can set the width.

Initial Value medium
Inherited No
Animatable Yes. The width of the border is animatable.
Version CSS1
JavaScript Syntax object.style.borderWidth = "1px 5px";

Syntax

border-width: medium | thin | thick | length | initial | inherit;

Example of the border-width property: 

<!DOCTYPE html>
<html>
  <head>
    <style>
      p {
      border-style: solid;
      border-width: 1px;
      padding: 5px;
      }
    </style>
  </head>
  <body>
    <p>This paragraph's border is selected as 1px.</p>
  </body>
</html>

Example of the border-width property with three values: 

<!DOCTYPE html>
<html>
  <head>
    <style>
      p {
      color: #666;
      padding: 5px;      
      border-style: solid; 
      } 
      .thin {
      border-width: 1px;
      }
      .medium{
      border-width: medium;
      }
      .thick {
      border-width: 10px;
      }
    </style>
  </head>
  <body>
    <p class="thin">This paragraph's border is selected as 1px.</p>
    <p class="medium">This paragraph's border is selected as medium.</p>
    <p class="thick">This paragraph's border is selected as 10px.</p>
  </body>
</html>

Result

Values

Value Description
medium Defines a medium border. This is default value.
thin Defines a thin border.
thick Defines a thick border.
length Defines the thickness of border.
initial Sets the property to its default value.
inherit Inherits the property from its parent element.

Browser support
1.0+ 12.0+ 1.0+ 1.0+ 3.5+

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