This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The margin-block CSS 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.

The values can be set individually as margin-block-start and margin-block-end. The inline direction property is margin-inline which sets margin-inline-start, and margin-inline-end.



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

Formal syntax

Syntax not found in DB!


HTML Content

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

CSS Content

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.

Value not found in DB!

Browser compatibilityUpdate compatibility data on GitHub

Chrome Edge Firefox Internet Explorer Opera Safari
Basic support No No No No No No
Android webview Chrome for Android Edge Mobile Firefox for Android Opera for Android iOS Safari Samsung Internet
Basic support No No No No No No No

See also

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