1. Large, Small, and Dynamic viewport units

    Viewport units similar to `vw` and `vh` that are based on shown or hidden browser UI states to address shortcomings of the original units. Currently defined as the `lvh`, `lvw`, `svh`, `svw`, `dvh`, `dvw` units.

  2. Viewport units: vw, vh, vmin, vmax

    Length units representing a percentage of the current viewport dimensions: width (vw), height (vh), the smaller of the two (vmin), or the larger of the two (vmax).

  3. css api: vh

  4. types: `<length-percentage>`: `vh` unit

  5. types: `<length>`: `vh` unit