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: 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 Status Comment
CSS Logical Properties and Values LevelĀ 1
The definition of 'min-block-size' in that specification.
Editor's Draft Initial definition

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
min-block-sizeChrome Full support 57Edge Full support 79Firefox Full support 41
Full support 41
No support 38Ā ā€” 51
Disabled
Disabled From version 38 until version 51 (exclusive): this feature is behind the layout.css.vertical-text.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE No support NoOpera Full support 44Safari Full support 12.1WebView Android Full support 57Chrome Android Full support 57Firefox Android Full support 41
Full support 41
No support 38Ā ā€” 51
Disabled
Disabled From version 38 until version 51 (exclusive): this feature is behind the layout.css.vertical-text.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android Full support 43Safari iOS Full support 12.2Samsung Internet Android Full support 7.0
fit-contentChrome Full support 57Edge Full support 79Firefox No support NoIE No support NoOpera Full support 44Safari Full support 12.1WebView Android Full support 57Chrome Android Full support 57Firefox Android No support NoOpera Android Full support 43Safari iOS Full support 12.2Samsung Internet Android Full support 7.0
Alternate Name
Full support 7.0
Alternate Name
Alternate Name Uses the non-standard name: -webkit-fill-available
max-contentChrome Full support 57Edge Full support 79Firefox Full support 66
Full support 66
Full support 41
Prefixed
Prefixed Implemented with the vendor prefix: -moz-
IE No support NoOpera Full support 44Safari Full support 12.1WebView Android Full support 57Chrome Android Full support 57Firefox Android Full support 66
Full support 66
Full support 41
Prefixed
Prefixed Implemented with the vendor prefix: -moz-
Opera Android Full support 43Safari iOS Full support 12.2Samsung Internet Android Full support 7.0
min-contentChrome Full support 57Edge Full support 79Firefox Full support 66
Full support 66
Full support 41
Prefixed
Prefixed Implemented with the vendor prefix: -moz-
IE No support NoOpera Full support 44Safari Full support 12.1WebView Android Full support 57Chrome Android Full support 57Firefox Android Full support 66
Full support 66
Full support 41
Prefixed
Prefixed Implemented with the vendor prefix: -moz-
Opera Android Full support 43Safari iOS Full support 12.2Samsung Internet Android Full support 7.0

Legend

Full support Ā 
Full support
No support Ā 
No support
User must explicitly enable this feature.
User must explicitly enable this feature.
Uses a non-standard name.
Uses a non-standard name.
Requires a vendor prefix or different name for use.
Requires a vendor prefix or different name for use.

See also