CSS timeline-trigger-active-range Property Reference

The CSS timeline-trigger-active-range property is a standard property in CSS Animations. Review its formal syntax, computed behavior, and practical declarations.

Updated 2026-08-12

timeline-trigger-active-range overview

The CSS timeline-trigger-active-range property is a standard property in CSS Animations. Review its formal syntax, computed behavior, and practical declarations.

The property is not inherited by default. Use an explicit global keyword when inheritance is intended.

Syntax and formal definition

timeline-trigger-active-range formal syntax

Field	Value
Formal syntax	[ <'timeline-trigger-active-range-start'> <'timeline-trigger-active-range-end'>? ]#
Initial value	timeline-trigger-active-range-start, timeline-trigger-active-range-end
Applies to	allElements
Inherited	No
Percentages	timeline-trigger-active-range-start, timeline-trigger-active-range-end
Computed value	timeline-trigger-active-range-start, timeline-trigger-active-range-end
Animation type	notAnimatable
Media	visual
Specification group	CSS Animations
Status	Standard

Practical examples

These declarations demonstrate valid ways to set timeline-trigger-active-range. The initial and inherit global keywords remain available even when a property-specific value is preferable.

timeline-trigger-active-range live example

CSS

.reset-example {
  timeline-trigger-active-range: initial;
}

.inherit-example {
  timeline-trigger-active-range: inherit;
}

@supports (timeline-trigger-active-range: initial) {
  .supported {
    timeline-trigger-active-range: initial;
  }
}