Declares a key/value object containing CSS properties/styles that can then be used for an animation state, within an animation sequence, or as styling data for calls to animate() and keyframes().

style(tokens: "*" | { [key: string]: string | number; } | ("*" | { [key: string]: string | number; })[]): AnimationStyleMetadata

tokens "*" | { [key: string]: string | number; } | ("*" | { [key: string]: string | number; })[]

A set of CSS styles or HTML styles associated with an animation state. The value can be any of the following:

  • A key-value style pair associating a CSS property with a value.
  • An array of key-value style pairs.
  • An asterisk (*), to use auto-styling, where styles are derived from the element being animated and applied to the animation when it starts.

Auto-styling can be used to define a state that depends on layout or other environmental factors.


AnimationStyleMetadata: An object that encapsulates the style data.

Usage notes

The following examples create animation styles that collect a set of CSS property values:

// string values for CSS properties
style({ background: "red", color: "blue" })

// numerical pixel values
style({ width: 100, height: 0 })

The following example uses auto-styling to allow an element to animate from a height of 0 up to its full height:

style({ height: 0 }),
animate("1s", style({ height: "*" }))

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