offset
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2022.
The offset CSS shorthand property sets all the properties required for animating an element along a defined path. The offset properties together help to define an offset transform, a transform that aligns a point in an element (offset-anchor) to an offset position (offset-position) on a path (offset-path) at various points along the path (offset-distance) and optionally rotates the element (offset-rotate) to follow the direction of the path.
Note: Early versions of the spec called this property motion.
Try it
offset: path("M 20 60 L 120 60 L 70 10 L 20 60") 0% auto 90deg; offset: path( "M 20 210 L 74 210 L 118 140 \ L 62 140 L 20 210" ) 20% auto; <section class="default-example" id="default-example"> <div class="wrapper"> <div id="example-element"></div> </div> <button id="playback" type="button">Play</button> </section> #example-element { width: 24px; height: 24px; background: #2bc4a2; clip-path: polygon(0% 0%, 70% 0%, 100% 50%, 70% 100%, 0% 100%, 30% 50%); animation: distance 3000ms infinite normal ease-in-out; animation-play-state: paused; } #example-element.running { animation-play-state: running; } .wrapper { height: 220px; width: 200px; background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 150 140" width="200" height="140"><path d="M 0 60 L 100 60 L 50 10 L 0 60" fill="none" stroke="lightgrey" stroke-width="2" stroke-dasharray="4.5"/></svg>') no-repeat, url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 -140 150 230" width="200" height="230"><path d="M 0 70 L 56 70 L 98 0 L 42 0 L 0 70" fill="none" stroke="lightgrey" stroke-width="2" stroke-dasharray="4.5"/></svg>'); } @keyframes distance { to { offset-distance: 100%; } } #playback { position: absolute; top: 0; left: 0; font-size: 1em; } const example = document.getElementById("example-element"); const button = document.getElementById("playback"); button.addEventListener("click", () => { if (example.classList.contains("running")) { example.classList.remove("running"); button.textContent = "Play"; } else { example.classList.add("running"); button.textContent = "Pause"; } }); Constituent properties
This property is a shorthand for the following CSS properties:
Syntax
css
/* Offset position */ offset: auto; offset: 10px 30px; offset: none; /* Offset path */ offset: ray(45deg closest-side); offset: path("M 100 100 L 300 100 L 200 300 z"); offset: url("arc.svg"); /* Offset path with distance and/or rotation */ offset: url("circle.svg") 100px; offset: url("circle.svg") 40%; offset: url("circle.svg") 30deg; offset: url("circle.svg") 50px 20deg; /* Including offset anchor */ offset: ray(45deg closest-side) / 40px 20px; offset: url("arc.svg") 2cm / 0.5cm 3cm; offset: url("arc.svg") 30deg / 50px 100px; /* Global values */ offset: inherit; offset: initial; offset: revert; offset: revert-layer; offset: unset; Formal definition
| Initial value | as each of the properties of the shorthand:
|
|---|---|
| Applies to | transformable elements |
| Inherited | no |
| Percentages | as each of the properties of the shorthand:
|
| Computed value | as each of the properties of the shorthand:
|
| Animation type | as each of the properties of the shorthand:
|
| Creates stacking context | yes |
Formal syntax
offset =
[ <'offset-position'>? [ <'offset-path'> [ <'offset-distance'> || <'offset-rotate'> ]? ]? ]! [ / <'offset-anchor'> ]?
<offset-position> =
normal |
auto |
<position>
<offset-path> =
none |
<offset-path> || <coord-box>
<offset-distance> =
<length-percentage>
<offset-rotate> =
[ auto | reverse ] ||
<angle>
<offset-anchor> =
auto |
<position>
<position> =
<position-one> |
<position-two> |
<position-four>
<offset-path> =
<ray()> |
<url> |
<basic-shape>
<coord-box> =
<paint-box> |
view-box
<length-percentage> =
<length> |
<percentage>
<position-one> =
left |
center |
right |
top |
bottom |
x-start |
x-end |
y-start |
y-end |
block-start |
block-end |
inline-start |
inline-end |
<length-percentage>
<position-two> =
[ left | center | right | x-start | x-end ] && [ top | center | bottom | y-start | y-end ] |
[ left | center | right | x-start | x-end | <length-percentage> ] [ top | center | bottom | y-start | y-end | <length-percentage> ] |
[ block-start | center | block-end ] && [ inline-start | center | inline-end ] |
[ start | center | end ]{2}
<position-four> =
[ [ left | right | x-start | x-end ] <length-percentage> ] && [ [ top | bottom | y-start | y-end ] <length-percentage> ] |
[ [ block-start | block-end ] <length-percentage> ] && [ [ inline-start | inline-end ] <length-percentage> ] |
[ [ start | end ] <length-percentage> ]{2}
<ray()> =
ray( <angle> &&
<ray-size>? &&
contain? &&
[ at <position> ]? )
<paint-box> =
<visual-box> |
fill-box |
stroke-box
<ray-size> =
closest-side |
closest-corner |
farthest-side |
farthest-corner |
sides
<visual-box> =
content-box |
padding-box |
border-box
Examples
Animating an element along a path
HTML
html
<div id="offsetElement"></div> CSS
css
@keyframes move { from { offset-distance: 0%; } to { offset-distance: 100%; } } #offsetElement { width: 50px; height: 50px; background-color: blue; offset: path("M 100 100 L 300 100 L 200 300 z") auto; animation: move 3s linear infinite; } Result
Specifications
| Specification |
|---|
| Motion Path Module Level 1 # offset-shorthand |
Browser compatibility
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