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 value0
Applies tosame as width and height
Inheritedno
Percentagesblock-size of containing block
Computed valuesame as min-width and min-height
Animation typea 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

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariWebView AndroidChrome AndroidFirefox for AndroidOpera AndroidSafari on iOSSamsung Internet
min-block-size
fit-content
fit-content()
Experimental
max-content
min-content
Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.
Uses a non-standard name.
Requires a vendor prefix or different name for use.

See also