CSSborder-block-start Property
Example
Set the width, color and style for the border at the start of the block direction:
border-block-start: 10px solid pink;
}
More "Try it Yourself" examples below.
Definition and Usage
Theborder-block-start property is a shorthand property for these properties:
The CSSborder-block-start property is very similar to CSS propertiesborder-bottom,border-left,border-right andborder-top, but theborder-block-start property is dependent on block direction.
Note: The related CSS propertywriting-mode defines block direction. This affects where the start and end of a block is and the result of theborder-block-start property. For pages in English, inline direction is left to right and block direction is downward.
| Default value: | medium nonecurrentcolor |
|---|---|
| Inherited: | no |
| Animatable: | yes.Read aboutanimatableTry 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
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 aboutinitial | |
| inherit | Inherits this property from its parent element.Read aboutinherit |
More Examples
With writing-mode property
The position of the border at the start of the block direction is affected by thewriting-mode property:
writing-mode: vertical-rl;
border-block-start: dotted blue;
}
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
