CSS max-block-size Property

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p {
  background-color: #1A73E8;
  max-block-size: 150px;


Lorem Ipsum is simply dummy text of the printing and typesetting industry.
Lorem Ipsum is simply dummy text of the printing and typesetting industry.


The max-block-size CSS property specifies the maximum size of an element in the direction opposite that of the writing direction as specified by writing-mode.

That is, if the writing direction is horizontal, then max-block-size is equivalent to max-height; if the writing direction is vertical, max-block-size is the same as max-width.

Note: The other dimension's maximum length is specified using the max-inline-size property.

This is useful because the max-width is always used for horizontal sizes and max-height is always used for vertical sizes, and if you need to set lengths based on the size of your text content, you need to be able to do so with the writing direction in mind.

Default value:none
JavaScript syntax:

Standard Syntax

max-block-size: none|length|percentage|max-content|min-content|fit-content(length|percentage)|initial|inherit|revert|revert-layer|unset;

Browser Support


Property Values

The following table describes the values of this property:

Value Description
none No limit on the size of the box.
length Defines the max-block-size as an absolute value.
percentage Defines the max-block-size as a percentage of the containing block's size in block axis.
max-content The intrinsic preferred max-block-size.
min-content The intrinsic minimum max-block-size.
fit-content(length|percentage) Uses the fit-content formula with the available space replaced by the specified argument, i.e. min(max-content, max(min-content, argument)).
initial Sets this property to its default value.
inherit If specified, the associated element takes the computed value of its parent element animation-delay property.
revert Reverts the cascaded value of the property from its current value to the value the property
revert-layer Rollback styles to the ones specified in previous cascade layers.
unset Resets a property to its inherited value if the property naturally inherits from its parent, and to its initial value if not.

Default CSS Property Values

selectors {
  max-block-size: none;
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