border-left-width | CSS CSS Properties

Controls the thickness of the physical left border. It can take keyword values like 'thin' or 'thick', but specific pixel values are most common.

Quick example

.thick-left {
  /* Physical left border thickness */
  border-left-width: 10px;
  border-left-style: solid;
  border-left-color: #eee;
}

Initial value

medium

Inherited

Applies to

all elements

Animation type

length

Widely available Since 2015 96% global usage

This feature is well established and works across many devices and browser versions. It has been available across browsers since 2015.

Safe to use without fallbacks.

12+