border-width
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Constituent properties
This property is a shorthand for the following CSS properties:
Syntax
css
/* Keyword values */
border-width: thin;
border-width: medium;
border-width: thick;
/* <length> values */
border-width: 4px;
border-width: 1.2rem;
/* top and bottom | left and right */
border-width: 2px 1.5em;
/* top | left and right | bottom */
border-width: 1px 2em 1.5cm;
/* top | right | bottom | left */
border-width: 1px 2em 0 4rem;
/* Global values */
border-width: inherit;
border-width: initial;
border-width: revert;
border-width: revert-layer;
border-width: unset;
The border-width
property may be specified using one, two, three, or four values.
- When one value is specified, it applies the same width to all four sides.
- When two values are specified, the first width applies to the top and bottom, the second to the left and right.
- When three values are specified, the first width applies to the top, the second to the left and right, the third to the bottom.
- When four values are specified, the widths apply to the top, right, bottom, and left in that order (clockwise).
Values
<line-width>
-
Defines the width of the border, either as an explicit nonnegative
<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
Formal syntax
border-width =
<line-width>{1,4}
<line-width> =
<length [0,∞]> |
thin |
medium |
thick
Examples
A mix of values and lengths
HTML
html
<p id="one-value">one value: 6px wide border on all 4 sides</p>
<p id="two-values">
two different values: 2px wide top and bottom border, 10px wide right and left
border
</p>
<p id="three-values">
three different values: 0.3em top, 9px bottom, and zero width right and left
</p>
<p id="four-values">
four different values: "thin" top, "medium" right, "thick" bottom, and 1em
left
</p>
CSS
css
#one-value {
border: ridge #ccc;
border-width: 6px;
}
#two-values {
border: solid red;
border-width: 2px 10px;
}
#three-values {
border: dotted orange;
border-width: 0.3em 0 9px;
}
#four-values {
border: solid lightgreen;
border-width: thin medium thick 1em;
}
p {
width: auto;
margin: 0.25em;
padding: 0.25em;
}
Result
Specifications
Specification |
---|
CSS Backgrounds and Borders Module Level 3 # the-border-width |
Browser compatibility
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See also
- The border-related shorthand properties:
border
,border-style
,border-color
- The border-width-related properties:
border-bottom-width
,border-left-width
,border-right-width
,border-top-width