timeline-trigger-activation-range-end CSS property

Syntax

css

/* Keyword or <length-percentage> */
timeline-trigger-activation-range-end: normal;
timeline-trigger-activation-range-end: 80%;
timeline-trigger-activation-range-end: 400px;

/* Named timeline range value */
timeline-trigger-activation-range-end: contain;
timeline-trigger-activation-range-end: exit;
timeline-trigger-activation-range-end: entry 100%;
timeline-trigger-activation-range-end: contain 600px;

/* Multiple range end values */
timeline-trigger-activation-range-end:
  contain,
  entry 100%;

/* Global values */
timeline-trigger-activation-range-end: inherit;
timeline-trigger-activation-range-end: initial;
timeline-trigger-activation-range-end: revert;
timeline-trigger-activation-range-end: revert-layer;
timeline-trigger-activation-range-end: unset;

The timeline-trigger-activation-range-end property is specified as one or more values, separated by commas.

Values

normal: Represents the end of the timeline. This is the default value.
<length-percentage>: Specifies a length or percentage value measured from the beginning of the timeline.
<timeline-range-name>: Specifies a named timeline range within the overall timeline. The range starts at 0%.
<timeline-range-name> <length-percentage>: Specifies a length or percentage value measured from the beginning of the specified named timeline range.

When creating CSS scroll-triggered animations, the timeline-trigger-activation-range-end property can be used to explicitly define the end of the trigger's activation range. Read the linked guide and the timeline-trigger-activation-range description for more information.

Allowed values for the timeline-trigger-activation-range-end property are:

normal
A <length-percentage>
A <timeline-range-name>
A <timeline-range-name> and a <length-percentage> separated by a space.

If the <timeline-range-name> value does not include a <length-percentage>, the percentage defaults to 100%.

The timeline-trigger-activation-range-end, along with the timeline-trigger-activation-range-start property, can both be set in a single declaration using the timeline-trigger-activation-range shorthand.

Specifying multiple range end values

When multiple values are specified in a single timeline-trigger-activation-range-end property, they are distributed between the specified timeline-trigger-name values in the same fashion as multiple animation values are distributed (see Setting multiple animation property values).

If multiple timeline-trigger-name values are set, but only a single timeline-trigger-activation-range-end value is set, the timeline-trigger-activation-range-end will apply to all the timeline-trigger-names. If two timeline-trigger-activation-range-end values are set, they will cycle between the timeline-trigger-names until all of them have a timeline-trigger-activation-range-end value set. And so on.

For example, consider these declarations:

css

timeline-trigger-name: --my-trigger, --my-other-trigger, --another-trigger;
timeline-trigger-activation-range-end:
  cover,
  entry 100%;

In this case, the first name will use the cover range end, and the second name will use the entry 100% range end. The third name will cycle back to using the cover range end again.

Formal definition

Value not found in DB!

Formal syntax

timeline-trigger-activation-range-end = 
  [ normal | <length-percentage> | <timeline-range-name> <length-percentage>? ]#  

<length-percentage> = 
  <length>      |
  <percentage>

Examples

Basic usage

In this example, we show how to create a basic scroll-triggered animation with a custom activation range end value.

HTML

Our markup contains two <div> elements, plus some basic text content to cause the page to scroll. We have hidden the text content for brevity.

html

<div class="animated">I am animated</div>

...

<div class="trigger">I create the trigger</div>

...

<div class="animated">I am animated</div>

<p>
  Fusce dictum ex quis ipsum consectetur placerat. Cras sed lectus ex. Quisque
  purus dolor, vulputate ac mi eget, commodo varius odio. Suspendisse faucibus
  ipsum vel libero finibus, in placerat nibh congue. Sed iaculis, metus et
  euismod posuere, mi diam vestibulum felis, ac vulputate eros ipsum id justo.
  Etiam a tincidunt purus. Maecenas semper sed enim at blandit. Aenean ut
  sagittis lorem, eget gravida purus. Phasellus eleifend, lectus nec pulvinar
  facilisis, dui dolor feugiat odio, iaculis tempor felis est non tortor. In
  suscipit lorem efficitur molestie tempus. Integer sit amet neque et risus
  iaculis sodales sed eget diam. Quisque sodales nunc sapien, vitae lacinia ex
  luctus quis. Maecenas scelerisque scelerisque elit eu consequat. Etiam ac
  tristique tellus, sed tincidunt velit.
</p>

<p>
  Fusce dictum ex quis ipsum consectetur placerat. Cras sed lectus ex. Quisque
  purus dolor, vulputate ac mi eget, commodo varius odio. Suspendisse faucibus
  ipsum vel libero finibus, in placerat nibh congue. Sed iaculis, metus et
  euismod posuere, mi diam vestibulum felis, ac vulputate eros ipsum id justo.
  Etiam a tincidunt purus. Maecenas semper sed enim at blandit. Aenean ut
  sagittis lorem, eget gravida purus. Phasellus eleifend, lectus nec pulvinar
  facilisis, dui dolor feugiat odio, iaculis tempor felis est non tortor. In
  suscipit lorem efficitur molestie tempus. Integer sit amet neque et risus
  iaculis sodales sed eget diam. Quisque sodales nunc sapien, vitae lacinia ex
  luctus quis. Maecenas scelerisque scelerisque elit eu consequat. Etiam ac
  tristique tellus, sed tincidunt velit.
</p>

<div class="trigger">I create the trigger</div>

<p>
  Fusce dictum ex quis ipsum consectetur placerat. Cras sed lectus ex. Quisque
  purus dolor, vulputate ac mi eget, commodo varius odio. Suspendisse faucibus
  ipsum vel libero finibus, in placerat nibh congue. Sed iaculis, metus et
  euismod posuere, mi diam vestibulum felis, ac vulputate eros ipsum id justo.
  Etiam a tincidunt purus. Maecenas semper sed enim at blandit. Aenean ut
  sagittis lorem, eget gravida purus. Phasellus eleifend, lectus nec pulvinar
  facilisis, dui dolor feugiat odio, iaculis tempor felis est non tortor. In
  suscipit lorem efficitur molestie tempus. Integer sit amet neque et risus
  iaculis sodales sed eget diam. Quisque sodales nunc sapien, vitae lacinia ex
  luctus quis. Maecenas scelerisque scelerisque elit eu consequat. Etiam ac
  tristique tellus, sed tincidunt velit.
</p>

<p>
  Fusce dictum ex quis ipsum consectetur placerat. Cras sed lectus ex. Quisque
  purus dolor, vulputate ac mi eget, commodo varius odio. Suspendisse faucibus
  ipsum vel libero finibus, in placerat nibh congue. Sed iaculis, metus et
  euismod posuere, mi diam vestibulum felis, ac vulputate eros ipsum id justo.
  Etiam a tincidunt purus. Maecenas semper sed enim at blandit. Aenean ut
  sagittis lorem, eget gravida purus. Phasellus eleifend, lectus nec pulvinar
  facilisis, dui dolor feugiat odio, iaculis tempor felis est non tortor. In
  suscipit lorem efficitur molestie tempus. Integer sit amet neque et risus
  iaculis sodales sed eget diam. Quisque sodales nunc sapien, vitae lacinia ex
  luctus quis. Maecenas scelerisque scelerisque elit eu consequat. Etiam ac
  tristique tellus, sed tincidunt velit.
</p>

CSS

The .animated <div> element has an animation applied that rotates it. We set an animation-trigger value on it that references a trigger name of --t; we also specify two <animation-action> values — play and pause — which specify that the animation will play on activation, and pause on deactivation.

The .trigger <div> element creates the animated <div>'s trigger using:

A timeline-trigger-name value of --t, which is equal to the identifier referenced in the animated <div>'s animation-trigger property value, associating the two together.
A timeline-trigger-source value of view(), which sets the timeline trigger as a view progress timeline, and the element providing the timeline trigger as the nearest scrolling ancestor element.
A timeline-trigger-activation-range-end of contain 60%, which sets the trigger's activation range end point to 60% of the way through the contain range (when the tracked element has scrolled a little over half way through the viewport in either direction). The timeline-trigger-activation-range-start value defaults to 0% of the way through the cover range, meaning that the animation will start when the tracked element has started to enter the viewport.

body {
  width: 80%;
  margin: 0 auto;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 1.3rem;
}

div {
  height: 100px;
  border: 5px solid black;
}

.animated {
  width: 100px;
  background: orange;
}

.trigger {
  background: wheat;
}

@supports not (timeline-trigger-name: --t) {
  body::before {
    font-family: sans-serif;
    font-size: 1.3rem;
    content: "Your browser does not support scroll-triggered animations.";
    background-color: wheat;
    position: fixed;
    left: 0;
    right: 0;
    top: 40%;
    text-align: center;
    padding: 1rem 0;
    z-index: 1;
  }
}

css

div.animated {
  animation: rotate 3s infinite linear both;
  animation-trigger: --t play pause;
}

div.trigger {
  timeline-trigger-name: --t;
  timeline-trigger-source: view();
  timeline-trigger-activation-range-end: contain 60%;
}

Next, we give the animated <div> a position of fixed, positioning it near the top-left of the viewport so that we can easily see when its animation starts and stops.

css

div.animated {
  position: fixed;
  top: 25px;
  left: 25px;
}

Finally, we define the @keyframes for the rotate animation:

css

@keyframes rotate {
  from {
    rotate: 0deg;
  }

  to {
    rotate: 360deg;
  }
}

Result

The rendered result looks like this:

Try scrolling the content up. When the tracked <div> starts to enter the viewport, the animation will play; when the tracked <div> has scrolled a little over half-way up the viewport, the animation will pause.

Specifications

This feature does not appear to be defined in any specification.

Browser compatibility

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