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. types: `<length>`: `dvb`, `dvh`, `dvi`, `dvmax`, `dvmin`, `dvw` units