CSS - min-block-size



HTML Content

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

CSS Content

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


/* <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;


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

Formal syntax

<a href="css/min-width" title="&lt;length&gt; | &lt;percentage&gt; | auto | max-content | min-content | fit-content | fill-available"><'min-width'></a>


The min-block-size CSS property defines the horizontal or vertical minimal size of an element's block depending on its writing mode. It corresponds to the min-width or the min-height property, depending on the value defined for writing-mode. If the writing mode is vertically oriented, the value of min-block-size relates to the minimal width of the element, otherwise it relates to the minimal height of the element. It relates to min-inline-size, which defines the other dimension of the element.

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

Browser Compatibility  

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support Not supported 41.0 (41.0)[1] Not supported Not supported Not supported
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support Not supported 41.0 (41.0)[1] Not supported Not supported Not supported

[1] Available since Gecko 38, but behind the preference layout.css.vertical-text.enabled, then disabled by default.

See Also  


Specification Status Comment
CSS Logical Properties Level 1
The definition of 'min-block-size' in that specification.
Editor's Draft Initial definition


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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

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