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.

/* <length> values */ min-block-size: 100px; min-block-size: 5em;  /* <percentage> values */ min-block-size: 10%;  /* Keyword values */ min-block-size: max-content; min-block-size: min-content; min-block-size: fit-content(20em);  /* Global values */ min-block-size: inherit; min-block-size: initial; min-block-size: revert; min-block-size: unset; 

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.

Syntax

/* <length> values */ min-block-size: 100px; min-block-size: 5em;  /* <percentage> values */ min-block-size: 10%;  /* Keyword values */ min-block-size: max-content; min-block-size: min-content; min-block-size: fit-content(20em);  /* Global values */ min-block-size: inherit; min-block-size: initial; min-block-size: revert; 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-width'>

Examples

Setting minimum block size for vertical text

HTML

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

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

See also

The mapped physical properties: min-width and min-height writing-mode

Last modified: Aug 12, 2021, by MDN contributors

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