offset-position

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

The offset-position CSS property defines the initial position of the offset-path.

Syntax

/* Keyword values */
offset-position: auto;
offset-position: top;
offset-position: bottom;
offset-position: left;
offset-position: right;
offset-position: center;

/* <percentage> values */
offset-position: 25% 75%;

/* <length> values */
offset-position: 0 0;
offset-position: 1cm 2cm;
offset-position: 10ch 8em;

/* Edge offsets values */
offset-position: bottom 10px right 20px;
offset-position: right 3em bottom 10px;
offset-position: bottom 10px right;
offset-position: top right 10px;

/* Global values */
offset-position: inherit;
offset-position: initial;
offset-position: revert;
offset-position: unset;

Values

auto: The initial position is the position of the box specified by the position property.
<position>: A <position>. A position defines an x/y coordinate, to place an item relative to the edges of an element's box. It can be defined using one to four values. If two non-keyword values are used, the first value represents the horizontal position and the second represents the vertical position. If only one value is specified, the second value is assumed to be center. If three or four values are used, the length-percentage values are offsets for the preceding keyword value(s). For more explanation of these value types, see background-position.

Formal definition

Initial value	`auto`
Applies to	transformable elements
Inherited	no
Percentages	referToSizeOfContainingBlock
Computed value	for `<length>` the absolute value, otherwise a percentage
Animation type	a position

Formal syntax

auto | <position>where 
<position> = [ [ left | center | right ] || [ top | center | bottom ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ]? | [ [ left | right ] <length-percentage> ] && [ [ top | bottom ] <length-percentage> ] ]
where 
<length-percentage> = <length> | <percentage>

Examples

Setting initial offset position

<div id="motion-demo"></div>

#motion-demo {
  offset-path: path('M20,20 C20,100 200,0 200,100');
  offset-position: left top;
  animation: move 3000ms infinite alternate ease-in-out;
  width: 40px;
  height: 40px;
  background: cyan;
}

@keyframes move {
  0% {
    offset-distance: 0%;
  }
  100% {
    offset-distance: 100%;
  }
}

Specifications

Specification
Motion Path Module Level 1 (Motion Path 1) # offset-position-property

Browser compatibility

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet
`offset-position`	No See bug 638055.	No	No See bug 1559232.	No	No	No	No	No	No	No	No	No