The @keyframes CSS at-rule lets authors control the intermediate steps in a CSS animation sequence by establishing keyframes (or waypoints) along the animation sequence that must be reached by certain points during the animation. This gives you more specific control over the intermediate steps of the animation sequence than you'd get when letting the browser handle everything automatically.
The animation-nameCSS property specifies a list of animations that should be applied to the selected element. Each name indicates a @keyframes at-rule that defines the property values for the animation sequence.
The CSSKeyframeRule interface describes an object representing a set of style for a given keyframe. It corresponds to the contains of a single keyframe of a @keyframesat-rule. It implements the CSSRule interface with a type value of 8 (CSSRule.KEYFRAME_RULE).
The CSSKeyframesRule interface describes an object representing a complete set of keyframes for a CSS animation. It corresponds to the contains of a whole @keyframesat-rule. It implements the CSSRule interface with a type value of 7 (CSSRule.KEYFRAMES_RULE).