max-block-size

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

Initial value	0
Applies to	same as width and height
Inherited	no
Percentages	block-size of containing block
Media	visual
Computed value	same as max-width and max-height
Animation type	discrete
Canonical order	the unique non-ambiguous order defined by the formal grammar

Syntax

/* <length> values */
max-block-size: 300px;
max-block-size: 25em;

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

/* Keyword values */
max-block-size: none;
max-block-size: max-content;
max-block-size: min-content;
max-block-size: fit-content;
max-block-size: fill-available;

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

Values

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

Formal syntax

<'max-width'>

Example

HTML Content

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

CSS Content

.exampleText {
  writing-mode: vertical-rl;
  background-color: yellow;
  block-size: 100%;
  max-block-size: 200px;
}

Specification

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

Browser compatibility

[1] Available since Gecko 38, but behind the preference layout.css.vertical-text.enabled, then disabled by default. The preference has been removed in Gecko 51 and this property cannot be disabled since this version.

See also

• The mapped physical properties: max-width and max-height
• writing-mode