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Showing content from https://developer.cdn.mozilla.net/en-US/docs/Web/CSS/block-size below:

block-size - CSS | MDN

block-size

Baseline Widely available *

The block-size CSS property defines the size of an element's block along the block axis. If the writing-mode is horizontal, it corresponds to the height; if the writing mode is vertical, it corresponds to the width. A related property is inline-size, which defines the other dimension of the element.

Try it
block-size: 150px;
writing-mode: horizontal-tb;
block-size: 150px;
writing-mode: vertical-rl;
block-size: auto;
writing-mode: horizontal-tb;
block-size: auto;
writing-mode: vertical-lr;
<section class="default-example" id="default-example">
  <div class="transition-all" id="example-element">
    This is a box where you can change the block-size.
  </div>
</section>
#example-element {
  display: flex;
  flex-direction: column;
  background-color: #5b6dcd;
  justify-content: center;
  color: white;
}
Syntax
/* <length> values */
block-size: 300px;
block-size: 25em;
block-size: anchor-size(height);
block-size: calc(anchor-size(--my-anchor block) * 0.75);

/* <percentage> values */
block-size: 75%;

/* Keyword values */
block-size: max-content;
block-size: min-content;
block-size: fit-content;
block-size: fit-content(20em);
block-size: auto;

/* Global values */
block-size: inherit;
block-size: initial;
block-size: revert;
block-size: revert-layer;
block-size: unset;
Values

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

Formal definition Formal syntax
block-size = 
<'width'>

<width> =


auto |
<length-percentage [0,∞]> |
min-content |
max-content |
fit-content( <length-percentage [0,∞]> ) |
<calc-size()> |
<anchor-size()>

<length-percentage> =


<length> |
<percentage>

<calc-size()> =


calc-size( <calc-size-basis> , <calc-sum> )

<anchor-size()> =


anchor-size( [ <anchor-name> || <anchor-size> ]? , <length-percentage>? )

<calc-size-basis> =


<size-keyword> |
<calc-size()> |
any |
<calc-sum>

<calc-sum> =


<calc-product> [ [ '+' | '-' ] <calc-product> ]*

<anchor-name> =


<dashed-ident>

<anchor-size> =


width |
height |
block |
inline |
self-block |
self-inline

<calc-product> =


<calc-value> [ [ '*' | / ] <calc-value> ]*

<calc-value> =


<number> |
<dimension> |
<percentage> |
<calc-keyword> |
( <calc-sum> )

<calc-keyword> =


e |
pi |
infinity |
-infinity |
NaN
Examples Block size with vertical text HTML
<p class="exampleText">Example text</p>
CSS
.exampleText {
  writing-mode: vertical-rl;
  background-color: yellow;
  block-size: 200px;
}
Result Specifications Browser compatibility See also

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