CSS border-block-start Property
Example
Set the width, color and style for the border at the start of the block direction:
div {
border-block-start:
10px solid pink;
}
Try it Yourself »
More "Try it Yourself" examples below.
Definition and Usage
The border-block-start property is a shorthand property for these properties:
The CSS
border-block-start property is very similar to CSS properties
border-bottom,
border-left,
border-right and
border-top, but the
border-block-start property is dependent on block direction.
Note: The related CSS property
writing-mode defines block direction. This affects where the start and end of a block is and the result of the border-block-start property. For pages in English, inline direction is left to right and block direction is downward.
| Default value: | medium none currentcolor |
|---|---|
| Inherited: | no |
| Animatable: | yes. Read about animatable Try it |
| Version: | CSS3 |
| JavaScript syntax: | object.style.borderBlockStart="pink dotted 5px" Try it |
Browser Support
The numbers in the table specify the first browser version that fully supports the property.
| Property | |||||
|---|---|---|---|---|---|
| border-block-start | 69.0 | 79.0 | 41.0 | 12.1 | 56.0 |
CSS Syntax
border-block-start: border-block-start-width border-block-start-style border-block-start-color|initial|inherit;
Property Values
| Value | Description | Demo |
|---|---|---|
border-block-start-width |
Specifies the width of an element's border at the end in the block direction. Default value is "medium" | Demo ❯ |
border-block-start-style |
Specifies the style of an element's border at the end in the block direction. Default value is "none" | Demo ❯ |
border-block-start-color |
Specifies the color of an element's border at the end in the block direction. Default value is the current color of the border | Demo ❯ |
| initial | Sets this property to its default value. Read about initial | |
| inherit | Inherits this property from its parent element. Read about inherit |
More Examples
With writing-mode property
The position of the border at the start of the block direction is affected by the writing-mode property:
div {
writing-mode: vertical-rl;
border-block-start:
dotted blue;
}
Try it Yourself »
Related Pages
CSS tutorial: CSS Border
CSS border property: CSS Border property
CSS border-block property: CSS Border-block property
CSS border-block-color property: CSS Border-block-color property
CSS border-block-start-color property: CSS Border-block-start-color property
CSS border-bottom-color property: CSS Border-bottom-color property
CSS border-left-color property: CSS Border-left-color property
CSS border-right-color property: CSS Border-right-color property
CSS border-top-color property: CSS Border-top-color property
CSS writing-mode property: CSS Writing-mode property