border-left-width
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-width CSS property sets the width of the left border of an element.
Try it
border-left-width: thick; border-left-width: 2em; border-left-width: 4px; border-left-width: 2ex; border-left-width: 0; <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: palegreen; color: black; border: 0 solid crimson; padding: 0.75em; width: 80%; height: 100px; } Syntax
css
/* 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: revert; border-left-width: revert-layer; border-left-width: unset; 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:thinmediumthick
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
| Initial value | medium |
|---|---|
| Applies to | all elements. It also applies to ::first-letter. |
| Inherited | no |
| Computed value | the absolute length or 0 if border-left-style is none or hidden |
| Animation type | a length |
Formal syntax
border-left-width =
<line-width>
<line-width> =
<length [0,∞]> |
thin |
medium |
thick
Examples
Comparing border widths
HTML
html
<div>Element 1</div> <div>Element 2</div> CSS
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 |
|---|
| CSS Backgrounds and Borders Module Level 3 # border-width |
Browser compatibility
Loading…
See also
- The other border-width-related CSS properties:
border-top-width,border-right-width,border-bottom-width, andborder-width. - The other border-left-related CSS properties:
border,border-left,border-left-style, andborder-left-color.