border-left CSS property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
The border-left shorthand CSS property sets all the properties of an element's left border.
Try it
border-left: solid;
border-left: dashed red;
border-left: 1rem solid;
border-left: thick double #32a1ce;
border-left: 4mm ridge rgb(211 220 50 / 0.6);
<section class="default-example" id="default-example">
<div class="transition-all" id="example-element">
This is a box with a border around it.
</div>
</section>
#example-element {
background-color: #eeeeee;
color: darkmagenta;
padding: 0.75em;
width: 80%;
height: 100px;
}
Constituent properties
This property is a shorthand for the following CSS properties:
Syntax
css
border-left: 1px;
border-left: 2px dotted;
border-left: medium dashed blue;
/* Global values */
border-left: inherit;
border-left: initial;
border-left: revert;
border-left: revert-layer;
border-left: unset;
The three values of the shorthand property can be specified in any order, and one or two of them may be omitted.
Values
<br-width>-
See
border-left-width. <br-style>-
See
border-left-style. <color>-
See
border-left-color.
Description
As with all shorthand properties, border-left 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. Consider the following code:
css
border-left-style: dotted;
border-left: thick green;
It is actually the same as this one:
css
border-left-style: dotted;
border-left: none thick green;
The value of border-left-style given before border-left is ignored. Since the default value of border-left-style is none, not specifying the border-style part results in no border.
Formal definition
| Initial value | as each of the properties of the shorthand:
|
|---|---|
| Applies to | all elements. It also applies to ::first-letter. |
| Inherited | no |
| Computed value | as each of the properties of the shorthand:
|
| Animation type | as each of the properties of the shorthand:
|
Formal syntax
border-left =
<line-width> ||
<line-style> ||
<color>
<line-width> =
<length [0,∞]> |
hairline |
thin |
medium |
thick
<line-style> =
none |
hidden |
dotted |
dashed |
solid |
double |
groove |
ridge |
inset |
outset
Examples
Applying a left border
HTML
html
<div>This box has a border on the left side.</div>
CSS
css
div {
border-left: 4px dashed blue;
background-color: gold;
height: 100px;
width: 100px;
font-weight: bold;
text-align: center;
}
Results
Specifications
| Specification |
|---|
| CSS Backgrounds and Borders Module Level 3 # border-shorthands |
Browser compatibility
| desktop | mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
border-left
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currentColor
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dashed
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dotted
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double
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groove
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hidden
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inset
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medium
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none
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outset
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ridge
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solid
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thick
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thin
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transparent
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Legend
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