block-size
Quick Summary for 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.
Code Usage for block-size
/* <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; 
More Details for block-size

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

Initial valueauto
Applies tosame as width and height
Inheritedno
Percentagesblock-size of containing block
Computed valuesame as width and height
Animation typea length, percentage or calc();

Formal syntax

<'width'>

Examples

Block size with vertical text

HTML
<p class="exampleText">Example text</p> 
CSS
.exampleText {   writing-mode: vertical-rl;   background-color: yellow;   block-size: 200px; } 
Result

Specifications

Specification
CSS Logical Properties and Values Level 1 # dimension-properties

See also

The mapped physical properties: width and height writing-mode

Last modified: Aug 12, 2021, by MDN contributors

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