1. Web Animations API

    Lets you create animations that are run in the browser, as well as inspect and manipulate animations created through declarative means like CSS.

  2. WebP image format

    Image format (based on the VP8 video format) that supports lossy and lossless compression, as well as animation and alpha transparency. WebP generally has better compression than JPEG, PNG and GIF and is designed to supersede them. [AVIF](/avif) and [JPEG XL](/jpegxl) are designed to supersede WebP.

  3. XHTML+SMIL animation

    Method of using SMIL animation in web pages

  4. css at-rule: `@media`: `-webkit-animation` media feature