The margin-block CSS shorthand property defines the logical block start and end margins of an element, which maps to physical margins depending on the element's writing mode, directionality, and text orientation.

/* <length> values */
margin-block: 10px 20px;  /* An absolute length */
margin-block: 1em 2em;   /* relative to the text size */
margin-block: 5% 2%;    /* relative to the nearest block container's width */
margin-block: 10px; /* sets both start and end values */

/* Keyword values */
margin-block: auto;

/* Global values */
margin-block: inherit;
margin-block: initial;
margin-block: unset;

These values corresponds to the margin-top and margin-bottom, or margin-right, and margin-left property depending on the values defined for writing-mode, direction, and text-orientation.

Constituent properties

This property is a shorthand for the following CSS properties:



The margin-block property takes the same values as the margin-left property.

Formal definition

Initial value0
Applies tosame as margin
Percentagesdepends on layout model
Computed valueif specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, auto
Animation typediscrete

Formal syntax



Setting block start and end margins


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


div {
  background-color: yellow;
  width: 120px;
  height: 120px;

.exampleText {
  writing-mode: vertical-rl;
  margin-block: 20px 40px;
  background-color: #c8c800;



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

Browser compatibility

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See also