margin-block-start
The margin-block-start CSS property defines the logical block start margin of an element, which maps to a physical margin depending on the element's writing mode, directionality, and text orientation.
Syntax
/* values */
margin-block-start: 10px; /* An absolute length */
margin-block-start: 1em; /* relative to the text size */
margin-block-start: 5%; /* relative to the nearest block container's width */
/* Keyword values */
margin-block-start: auto;
/* Global values */
margin-block-start: inherit;
margin-block-start: initial;
margin-block-start: revert;
margin-block-start: unset;
It corresponds to the margin-top, margin-right, margin-bottom, or margin-left property depending on the values defined for writing-mode, direction, and text-orientation.
It relates to margin-block-end, margin-inline-start, and margin-inline-end, which define the other margins of the element.
Values
The margin-block-start property takes the same values as the margin-left property.
Formal definition
Initial value0Applies tosame as marginInheritednoPercentagesdepends on layout modelComputed valueif specified as a length, the corresponding absolute length; if specified as a percentage, the specified value; otherwise, autoAnimation typea length
Formal syntax
Examples
Setting block start margin
HTML
Example text
CSS
div {
background-color: yellow;
width: 120px;
height: 120px;
}
.exampleText {
writing-mode: vertical-lr;
margin-block-start: 20px;
background-color: #c8c800;
}
Result
Specifications
SpecificationCSS Logical Properties and Values Level 1 [CSS Logical Properties 1]# margin-properties
Browser compatibility
BCD tables only load in the browser
See also
- The mapped physical properties: margin-top, margin-right, margin-bottom, and margin-left
- writing-mode, direction, text-orientation