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

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
min-block-size
57
79
41
No
44
12.1
57
57
41
43
12.2
7.0
fit-content
57
79
No
No
44
12.1
57
57
No
43
12.2
7.0
fit-content_function
No
No
91
No
No
No
No
No
91
No
No
No
max-content
57
79
66
41
No
44
12.1
57
57
66
41
43
12.2
7.0
min-content
57
79
66
41
No
44
12.1
57
57
66
41
43
12.2
7.0

See also

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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/CSS/min-block-size