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Summary

The effect of the CSS margin-right property on the element boxThe margin-right CSS property of an element sets the margin space required on the right side of an element. A negative value is also allowed.

The vertical margins of two adjacent boxes may fuse. This is called margin collapsing.

Initial value0
Applies toall elements, except elements with table display types other than table-caption, table and inline-table. It also applies to ::first-letter.
Inheritedno
Percentagesrefer to the width of the containing block
Mediavisual
Computed valuethe percentage as specified or the absolute length
Animatableyes, as a length
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Syntax

/* <length> values */
margin-right: 20px;        /* An absolute length */
margin-right: 1em;         /* A length relative to the text size */
margin-right: 5%;          /* A margin relative to the nearest block container's width */

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

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

Values

<length>
Is a <length> specifying a fixed width: it can be absolute width, e.g. in px, or a width relative to the text size, e.g. in em, or relative to the viewport size, e.g. in vh.
<percentage>
Is a <percentage> relative to the width of the nearest containing block.
auto
Is a keyword indicating that the right margin receives a share of the remaining space, defined mainly by the current layout mode.. If there several auto values for margin-left or margin-right, the calculated space is evenly distributed between all the auto values. This table summarizes the different cases:
Value of display Value of float Value of position Computed value of auto Comment
inline, inline-block, inline-table any static or relative 0 Inline layout mode
block, inline, inline-block, block, table, inline-table, list-item, table-caption any static or relative 0, except if both margin-left and margin-right are set to auto. In this case, it is set to the value centering the element inside its parent. Block layout mode
block, inline, inline-block, block, table, inline-table, list-item, table-caption left or right static or relative 0 Block layout mode (floating element)
any table-*, except table-caption any any 0 Internal table-* elements don't have margins, use border-spacing instead
any, except flex, inline-flex, or table-* any fixed or absolute 0, except if both margin-left and margin-right are set to auto. In this case, it is set to the value centering the border area inside the available width, if fixed. Absolutely positioned layout mode
flex, inline-flex any any 0, except if there is any positive horizontal free space. In this case, it is evenly distributed to all horizontal auto margins. Flexbox layout mode

Formal syntax

<length> | <percentage> | auto

Examples

.content { margin-right: 5%; }
.sidebox { margin-right: 10px; }
.logo    { margin-right: -5px; }

Specifications

Specification Status Comment
CSS Basic Box Model
The definition of 'margin-right' in that specification.
Working Draft No significant change
CSS Transitions
The definition of 'margin-right' in that specification.
Working Draft Defines margin-right as animatable.
CSS Flexible Box Layout Module
The definition of 'margin-right' in that specification.
Candidate Recommendation Defines the behavior of margin-right on flex items.
CSS Level 2 (Revision 1)
The definition of 'margin-right' in that specification.
Recommendation Removes its effect on inline elements.
CSS Level 1
The definition of 'margin-right' in that specification.
Recommendation Initial definition

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 1.0 1.0 (1.7 or earlier) 3.0 3.5 1.0 (85)
auto value 1.0 1.0 (1.7 or earlier) 6.0 (strict mode) 3.5 1.0 (85)
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support 1.0 1.0 (1) 6.0 6.0 1.0

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