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CSS min-block-size Property

Last Updated : 10 Jun, 2026

The CSS min-block-size property sets the minimum size of an element in the block direction, preventing it from shrinking below a specified limit.

  • Prevents an element from becoming smaller than the specified minimum block size.
  • Adapts to different writing modes by controlling the block dimension.
  • Helps maintain consistent layouts and improves content readability.

Syntax:

min-block-size: length | percentage | auto | min-content | max-content | fit-content | inherit | initial | unset;

Property values

  • length: It sets a fixed value defined in px, cm, pt etc. Negative values are also allowed. Its default value is 0px.
  • percentage (%): It is the same as length but the size is set in term of percentage of the window size.
  • auto: It is used when it is desired that the browser determines the block-size.
  • none: It is used when you don't want to limit on the size of the box.
  • max-content: It is used when you preferred min-width on the size of the box.
  • min-content: It is used when you preferred min-width on the size of the box.
  • fit-content: It is used when you preferred exact-width on the size of the box.
  • initial: It is used to set the value of the min-block-size property to its default value.
  • inherit: It is used when it is desired that the element inherits the min-block-size property from its parent element.
  • unset: It is used to unset the default mix-block-size.

Examples of min-block-size Property

Below examples illustrate the min-block-size property in CSS: 

Example 1: The min-block-size property ensures that the cyan box maintains a minimum block size of 40px, preventing it from shrinking below that size even if the content requires less space.

Example 2:  The min-block-size property sets a minimum block size of 80px for the vertically oriented cyan box, preventing it from shrinking below that size regardless of the content length.

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