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

Specification
CSS Logical Properties and Values Level 1 (CSS Logical Properties 1) # propdef-min-block-size

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