vw - 1% of the viewports width
vh - 1% of the viewports height
vmin - 1% of the viewports smaller dimension (in portrait, this would be width)
vmax - 1% of the viewports larger dimension (in portrait, this would be height)
In addition to these standard viewport units, CSS Values and Units Level 4 is adding some more viewport sizes: large, small, and dynamic viewport.
The large viewport uses the l prefix: lvh, lvw, lvmin, and lvmax. This calculates the viewport assuming any user agent (UA) interfaces are retracted.
The small viewport uses the s prefix and does the opposite, it assumes everything is expanded.
The dynamic viewport uses the d prefix and is aptly named. It adjusts itself depending on if the UA elements are shown or not. The value will always be in between the limits of the large and small.
Of course there's also the [[20210524133704-css-logical-properties]] implementations for these units too, such as vi, dvi, and svb.
[[browsers]] [[css]] [[responsivedesign]] [[web]]