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Geoff Graham on

inset-inline-end is a CSS property that sets the length that an element is offset in the starting inline direction. It’s sort of like declaring right in that it applies to positioned elements and offsets an element in the left direction, except its starting and ending points can changed based on the element’s direction, text-orientation and writing-mode, just like other logical properties.

The property is part of the CSS Logical Properties and Values Level 1 specification which is currently in Editor’s Draft status. That means the definition and information about it can change between now and official recommendation.

.element {
  inset-inline-end: 50px;
  position: relative; /* Apples to positioned elements */
  writing-mode: vertical-rl; /* Determines the block start direction */

So, for example, if the writing mode is set to horizontal-lr the inset-inline-end property will act just like setting left, offsetting an element from the left edge. You even need to specify an explicit position on the same element for it to take effect, just like physical offset properties.

But change the element’s writing-mode to something like vertical-lr and the “starting” edge is rotated in the vertical direction, acting more like the top instead.


inset-inline-end: <'left'>;
  • Initial value: auto
  • Applies to: positioned elements
  • Inherited: no
  • Percentages: as for the corresponding physical property
  • Computed value: same as corresponding left property
  • Animation type: by computed value type


inset-block takes a length value and supports global keywords. Its default value is auto.

/* Length values */
inset-inline-end: 50px;
inset-inline-end: 4em;
inset-inline-end: 3.5rem
inset-inline-end: 25vh;

/* Percentage values */
inset-inline-end: 50%;

/* Keyword values */
inset-inline-end: auto; /* initial value */

/* Global values */
inset-inline-end: initial
inset-inline-end: inherit;
inset-inline-end: unset;

Browser support

Android ChromeAndroid FirefoxAndroid BrowseriOS SafariOpera Mini
Source: caniuse


Further reading