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    border-bottom

    Summary

    The border-bottom CSS property is a shorthand that sets the values of border-bottom-color, border-bottom-style, and border-bottom-width. These properties describe the bottom border of elements.

    The three values of the shorthand property can be specified in any order, and one or two of them may be omitted.

    As with all shorthand properties, border-bottom always sets the values of all of the properties that it can set, even if they are not specified. It sets those that are not specified to their default values. This means that:

    border-bottom-style: dotted;
    border-bottom: thick green;
    is actually the same as
    border-bottom-style: dotted;
    border-bottom: none thick green;
    and the value of border-bottom-style given before border-bottom is ignored.

     

    Since the default value of border-bottom-style is none, not specifying the border-style part of the value means that the property specifies its default value which is none and means no border.

    • Initial value the concatenation of the initial values of its longhand properties:
      • border-bottom-width: medium
      • border-bottom-style: none
      • border-bottom-color: currentColor
    • Applies to all elements. It also applies to ::first-letter.
    • Inherited no
    • Media visual
    • Computed value as each of the properties of the shorthand:
      • border-bottom-width: the absolute length or 0 if border-bottom-style is none or hidden
      • border-bottom-style: as specified
      • border-bottom-color: If the value is translucent, the computed value will be the rgba() corresponding one. If it isn't, it will be the rgb() corresponding one. The transparent keyword maps to rgba(0,0,0,0).
    • Animatable as each of the properties of the shorthand:
      • border-bottom-color: yes, as a color
      • border-bottom-style: no
      • border-bottom-width: yes, as a length
    • Canonical order order of appearance in the formal grammar of the values

    Syntax

    border-bottom: 1px;
    border-bottom: 2px dotted;
    border-bottom: medium dashed blue;
    

    Values

    <br-width> 
    See border-bottom-width.
    <br-style> 
    See border-bottom-style.
    <color> 
    See border-bottom-color.

    Formal syntax

    <br-width> || <br-style> || <color>

    where
    <br-width> = <length> | thin | medium | thick
    <br-style> = none | hidden | dotted | dashed | solid | double | groove | ridge | inset | outset

    Examples

    View Live Examples

    element { 
      border-bottom: 1px solid #000;
    }
    

    Specifications

    Specification Status Comment
    CSS Backgrounds and Borders Module Level 3
    The definition of 'border-bottom' in that specification.
    Candidate Recommendation No direct changes, though the modification of values for the border-bottom-color do apply to it.
    CSS Level 2 (Revision 1)
    The definition of 'border-bottom' in that specification.
    Recommendation No significant changes
    CSS Level 1
    The definition of 'border-bottom' in that specification.
    Recommendation  

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
    Basic support 1.0 1.0 (1.7 or earlier) 4 3.5 1.0 (85)
    Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
    Basic support 1.0 1.0 (1.0) (Yes) (Yes) (Yes)

    See also

    Document Tags and Contributors

    Last updated by: Sebastianz,