border-bottom-width property CSS Reference

Definition and Usage

The border-bottom-width CSS property sets the width of the bottom border of a box.

• Initial medium
• Applies to all elements
• Inherited no
• Media visual
• Computed Value the absolute length or 0 if border-bottom-style is none or hidden
• Animatable yes, as a length
• Canonical order the unique non-ambiguous order defined by the formal grammar

Syntax

Formal syntax: <br-width>

border-bottom-width: 10em    /* Any <length> value */
border-bottom-width: 3vmax
border-bottom-width: 6px
border-bottom-width: thin    /* A keyword */
border-bottom-width: medium
border-bottom-width: thick
border-right-width: inherit

Values

<br-width>

Is either a non-negative explicit <length> value or a keyword denoting the thickness of the bottom border. The keyword must be one of the following values:

thin		A thin border
medium		A medium border
thick		A thick border

The specification doesn't precisely define the thickness of each of the keywords, which is therefore implementation specific. Nevertheless, it requests that the thickness does follow the thin ≤ medium ≤ thick inequality and that the values are constant on a single document.

inherit

Represents the calculated value of the border-bottom-width of the parent's element.

Examples

element {
    border-bottom-width: thin;
    border-bottom-style: solid;
    border-bottom-color: #000;
}

Compatibility

Desktop browsers

Mobile browsers