CSS block-size Property
Example
Set the size of a <div> element in the block direction:
div {
block-size: 200px;
}
Try it Yourself »
More "Try it Yourself" examples below.
Definition and Usage
The block-size property specifies the size of an element in the block direction.
Note: The related CSS property writing-mode defines block direction, and this affects the result of the block-size property. For pages in English, block direction is downward and inline direction is left to right.
The CSS
block-size and
inline-size properties are very similar to CSS properties
width and
height, but the
block-size and
inline-size properties are dependent on block and inline directions.
| Default value: | auto |
|---|---|
| Inherited: | no |
| Animatable: | yes. Read about animatable Try it |
| Version: | CSS3 |
| JavaScript syntax: | object.style.blockSize="100px" Try it |
Browser Support
The numbers in the table specify the first browser version that fully supports the property.
| Property | |||||
|---|---|---|---|---|---|
| block-size | 57.0 | 79.0 | 41.0 | 12.1 | 44.0 |
CSS Syntax
inset-block: auto|value|initial|inherit;
Property Values
| Value | Description | Demo |
|---|---|---|
| auto | Default. The element's default block-size value. | Demo ❯ |
| length | Specifies block-size in px, pt, cm, etc. Read about length units | Demo ❯ |
| % | Specifies block-size in percent relative to size of parent element on the corresponding axis. | 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
Example
With the writing-mode property value of a <div> element set to 'vertical-rl', block direction is moved from downwards to sideways, and this changes the direction the block-size property works in:
div {
block-size: 250px;
writing-mode: vertical-rl;
}
Try it Yourself »
Related Pages
CSS tutorial: CSS Height and Width
CSS tutorial: CSS Box model
CSS reference: height property
CSS reference: width property
CSS reference: writing-mode property