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

The scroll-timeline CSS shorthand property is used to define a named timeline that drives the progress of the scrollbar in a container. The name is then referenced in an animation-timeline declaration to indicate the container's element that is used to drive the progress of the animation through the scrolling action.

Optionally, the scroll axis of the scrollbar can be specified. The starting scroll position represents 0% progress and the ending scroll position represents 100% progress. If the 0% position and 100% position coincide (i.e., the scroll container has no overflow to scroll), the timeline is inactive.

Note: If the element does not overflow its container in the axis dimension or if the overflow is hidden or clipped, no timeline will be created.

Constituent properties

This property is a shorthand for the following CSS properties:


/* two values: one each for scroll-timeline-name and scroll-timeline-axis */
scroll-timeline: custom_name_for_timeline block;
scroll-timeline: custom_name_for_timeline inline;
scroll-timeline: custom_name_for_timeline vertical;
scroll-timeline: custom_name_for_timeline horizontal;
scroll-timeline: none block;
scroll-timeline: none inline;
scroll-timeline: none vertical;
scroll-timeline: none horizontal;

/* one value: scroll-timeline-name */
scroll-timeline: none;
scroll-timeline: custom_name_for_timeline;

The scroll-timeline shorthand property can be applied to a container element as a combination of the <scroll-timeline-name> and <scroll-timeline-axis> values. At least one of the values must be specified. If both the values are specified, the order followed must be the <scroll-timeline-name> value followed by the <scroll-timeline-axis> value.

Note: When only one value is specified, the scroll-timeline shorthand property treats it as the <scroll-timeline-name> value. As a best practice, avoid using <scroll-timeline-axis> keyword values as a <scroll-timeline-name> value.



See scroll-timeline-name.


See scroll-timeline-axis. The default value is block.

Formal definition

Initial valueas each of the properties of the shorthand:
Applies toscroll containers
Computed valueas each of the properties of the shorthand:
Animation typeas each of the properties of the shorthand:

Formal syntax

scroll-timeline = 
<'scroll-timeline-name'> ||


Creating a scroll-driven animation

In this example, a scroll timeline named squareTimeline is defined using the scroll-timeline-name property on the element with the ID container. This is then applied to the animation on the #square element using animation-timeline: squareTimeline.


The HTML for the example is shown below.

<div id="container">
  <div id="square"></div>
  <div id="stretcher"></div>


The CSS for the container sets it as the source of a scroll timeline named squareTimeline using the scroll-timeline property. It also sets the scrollbar to use for the timeline as "vertical" (though this was not actually needed as it would have been used by default).

The height of the container is set to 300px, and the container is also set to create a vertical scrollbar if it overflows (the CSS height rule on the stretcher element below does make the content overflow its container).

#container {
  height: 300px;
  overflow-y: scroll;
  scroll-timeline: squareTimeline vertical;
  position: relative;

The CSS below defines a square that rotates according to the timeline provided by the animation-timeline property, which is set to the squareTimeline timeline named above.

#square {
  background-color: deeppink;
  width: 100px;
  height: 100px;
  animation-name: rotateAnimation;
  animation-duration: 1ms;
  animation-timeline: squareTimeline;
  position: absolute;
  bottom: 0;

#stretcher {
  height: 600px;
  background: #dedede;

@keyframes rotateAnimation {
  from {
    transform: rotate(0deg);

  to {
    transform: rotate(360deg);

The stretcher CSS rule sets the block height to 600px, which creates content that overflows the container element, thereby creating scroll bars. Without this element, the content would not overflow the container, there would be no scrollbar, and hence no scroll timeline to associate with the animation timeline.


Scroll the vertical bar to see the square animate as you scroll.

The square animates as you scroll, and the animation duration when using scroll-timeline really depends on the scroll speed (nevertheless, the animation-duration property has been defined so you can make out the scroll-driven animation).


Scroll-driven Animations
# scroll-timeline-shorthand

Browser compatibility

BCD tables only load in the browser

See also