min-block-size

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

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

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Syntax

css

/* <length> values */
min-block-size: 100px;
min-block-size: 5em;
min-block-size: anchor-size(self-inline);

/* <percentage> values */
min-block-size: 10%;

/* Keyword values */
min-block-size: max-content;
min-block-size: min-content;
min-block-size: fit-content;
min-block-size: fit-content(20em);

/* Global values */
min-block-size: inherit;
min-block-size: initial;
min-block-size: revert;
min-block-size: revert-layer;
min-block-size: unset;

Values

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

Formal definition

Initial value	`0`
Applies to	same as `width` and `height`
Inherited	no
Percentages	block-size of containing block
Computed value	same as `min-width` and `min-height`
Animation type	a length, percentage or calc();

Formal syntax

min-block-size = 
<'min-width'>  

<min-width> = 
auto                                      |
<length-percentage [0,∞]>                 |
min-content                               |
max-content                               |
fit-content( <length-percentage [0,∞]> )  |
<calc-size()>                             

<length-percentage> = 
<length>      |
<percentage>  

<calc-size()> = 
calc-size( <calc-size-basis> , <calc-sum> )  

<calc-size-basis> = 
<intrinsic-size-keyword>  |
<calc-size()>             |
any                       |
<calc-sum>                

<calc-sum> = 
<calc-product> [ [ '+' | '-' ] <calc-product> ]*  

<calc-product> = 
<calc-value> [ [ '*' | '/' ] <calc-value> ]*  

<calc-value> = 
<number>        |
<dimension>     |
<percentage>    |
<calc-keyword>  |
  ( <calc-sum> )  

<calc-keyword> = 
e          |
pi         |
infinity   |
-infinity  |
NaN

Examples

Setting minimum block size for vertical text

HTML

html

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

CSS

css

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

Result

Specifications

Specification
CSS Logical Properties and Values Level 1 # propdef-min-block-size
CSS Box Sizing Module Level 4 # sizing-values

Browser compatibility

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