2021・12・16

animation-fill-mode is a css property that can control when css properties are applied during a css animation

• backwards applies the css property on the first animation keyframe
• forwards applies the css property on the last animation keyframe
• both The animation will follow the rules for both forwards and backwards, thus extending the animation properties in both directions.

https://developer.mozilla.org/en-US/docs/Web/CSS/animation-fill-mode