border-left-width

{{CSSRef}} 

The border-left-width CSS property sets the width of the left border of an element.

{{EmbedInteractiveExample("pages/css/border-left-width.html")}} 

Syntax

/* Keyword values */
border-left-width: thin;
border-left-width: medium;
border-left-width: thick;

/* <length> values */
border-left-width: 10em;
border-left-width: 3vmax;
border-left-width: 6px;

/* Global keywords */
border-left-width: inherit;
border-left-width: initial;
border-left-width: revert;
border-left-width: revert-layer;
border-left-width: unset;

Values

• <line-width>

  • : Defines the width of the border, either as an explicit nonnegative {{cssxref("<length>")}}  or a keyword. If it’s a keyword, it must be one of the following values:

    • thin
    • medium
    • thick

[!NOTE] Because the specification doesn’t define the exact thickness denoted by each keyword, the precise result when using one of them is implementation-specific. Nevertheless, they always follow the pattern thin ≤ medium ≤ thick, and the values are constant within a single document.

Formal definition

{{CSSInfo}} 

Formal syntax

{{csssyntax}} 

Examples

Comparing border widths

HTML

<div>Element 1</div>
<div>Element 2</div>

CSS

div {
  border: 1px solid red;
  margin: 1em 0;
}

div:nth-child(1) {
  border-left-width: thick;
}
div:nth-child(2) {
  border-left-width: 2em;
}

Result

{{EmbedLiveSample('Comparing_border_widths', '100%')}} 

Specifications

{{Specifications}} 

Browser compatibility

{{Compat}} 

See also

• The other border-width-related CSS properties: {{Cssxref("border-top-width")}} , {{Cssxref("border-right-width")}} , {{Cssxref("border-bottom-width")}} , and {{Cssxref("border-width")}} .
• The other border-left-related CSS properties: {{Cssxref("border")}} , {{Cssxref("border-left")}} , {{Cssxref("border-left-style")}} , and {{Cssxref("border-left-color")}} .