/* <length> values */ block-size: 300px; block-size: 25em;  /* <percentage> values */ block-size: 75%;  /* Keyword values */ block-size: max-content; block-size: min-content; block-size: fit-content(20em); block-size: auto;  /* Global values */ block-size: inherit; block-size: initial; block-size: revert; block-size: unset; 

block-size

The block-size CSS property defines the horizontal or vertical size of an element's block, depending on its writing mode. It corresponds to either the width or the height property, depending on the value of writing-mode.

If the writing mode is vertically oriented, the value of block-size relates to the width of the element; otherwise, it relates to the height of the element. A related property is inline-size, which defines the other dimension of the element.

Syntax

/* <length> values */ block-size: 300px; block-size: 25em;  /* <percentage> values */ block-size: 75%;  /* Keyword values */ block-size: max-content; block-size: min-content; block-size: fit-content(20em); block-size: auto;  /* Global values */ block-size: inherit; block-size: initial; block-size: revert; block-size: unset; 

Values

The block-size property takes the same values as the width and height properties.

Formal definition

Formal syntax

<'width'>

Examples

Block size with vertical text

<p class="exampleText">Example text</p> 

.exampleText {   writing-mode: vertical-rl;   background-color: yellow;   block-size: 200px; } 

Specifications

See also

Last modified: Aug 12, 2021, by MDN contributors