CSS timeline-trigger Property Reference

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

Updated 2026-08-12

timeline-trigger overview

The CSS timeline-trigger 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 formal syntax

Field	Value
Formal syntax	none \| [ <'timeline-trigger-name'> <'timeline-trigger-source'> <'timeline-trigger-activation-range'> [ '/' <'timeline-trigger-active-range'> ]? ]#
Initial value	timeline-trigger-name, timeline-trigger-source, timeline-trigger-activation-range, timeline-trigger-active-range
Applies to	allElements
Inherited	No
Percentages	no
Computed value	timeline-trigger-name, timeline-trigger-source, timeline-trigger-activation-range, timeline-trigger-active-range
Animation type	timeline-trigger-name, timeline-trigger-source, timeline-trigger-activation-range, timeline-trigger-active-range
Media	visual
Specification group	CSS Animations
Status	Standard

Practical examples

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

timeline-trigger live example

CSS

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

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

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