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This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

 

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.

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;
min-block-size: fill-available;

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

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.

Initial value0
Applies tosame as width and height
Inheritedno
Percentagesblock-size of containing block
Mediavisual
Computed valuesame as min-width and min-height
Animation typediscrete
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Values

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

Formal syntax

<'min-width'>

Example

HTML

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

CSS

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

Specification

Specification Status Comment
CSS Logical Properties and Values Level 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 No support NoFirefox Full support 41
Full support 41
No support 38 — 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 38 — 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 Yes
fit-contentChrome Full support 57Edge No support NoFirefox 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 5.0
Alternate Name
Full support 5.0
Alternate Name
Alternate Name Uses the non-standard name: -webkit-fill-available
max-contentChrome Full support 57Edge No support NoFirefox 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 5.0
min-contentChrome Full support 57Edge No support NoFirefox 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 5.0

Legend

Full support  
Full support
No support  
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

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