The border-left-width
CSS property sets the width of the left border of a box.
/* 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: unset;
Initial value | medium |
---|---|
Applies to | all elements. It also applies to ::first-letter . |
Inherited | no |
Media | visual |
Computed value | the absolute length or 0 if border-left-style is none or hidden |
Animation type | a length |
Canonical order | the unique non-ambiguous order defined by the formal grammar |
Syntax
Values
<br-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
A thin border medium
A medium border thick
A thick border 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 syntax
<br-width>
Example
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
Specifications
Specification | Status | Comment |
---|---|---|
CSS Backgrounds and Borders Module Level 3 The definition of 'border-left-width' in that specification. |
Candidate Recommendation | No significant change. |
CSS Level 2 (Revision 1) The definition of 'border-left-width' in that specification. |
Recommendation | No significant change. |
CSS Level 1 The definition of 'border-left-width' in that specification. |
Recommendation | Initial definition. |
Browser compatibility
The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 1 | Yes | 1 | 4 | 3.5 | 1 |
Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | IE mobile | Opera Android | iOS Safari |
---|---|---|---|---|---|---|---|
Basic support | 2.3 | ? | Yes | 4 | 6 | 11 | 1 |
See also
- The other border-width-related CSS properties:
border-bottom-width
,border-right-width
,border-top-width
, andborder-width
. - The other border-left-related CSS properties:
border
,border-left
,border-left-style
, andborder-left-color
.
Document Tags and Contributors
Tags:
Contributors to this page:
teoli,
mfluehr,
elysdir1,
erikadoyle,
samuelpath,
Prinz_Rana,
Sebastianz,
fscholz,
jsx,
Martyr2,
kscarfone,
Sheppy,
ethertank,
Yuichiro,
Killerowski,
Mgjbot,
BijuGC
Last updated by:
teoli,