2023
3 featuresThe lh CSS length unit corresponds to the requested line height, the computed value of the line-height property. Some lines may be higher than this based on their content.
The rlh CSS length unit is a font-relative length relative to the line height of root element.
2022
1 features2020
1 features2017
1 featuresThe vw, vh, vmin, and vmax CSS viewport units are relative to the size of the viewport, and are used to size elements in relation to the viewport's dimensions.
2015
4 featuresThe ch CSS length unit is a font-relative length based on the width of the zero (0) character.
The em CSS length unit is a font-relative length equal to the specified font size. In an element with a 2 inch font, 1em equals 2 inches.
The ex CSS length unit is a font-relative length equal to the used x-height of the first available font. X-height is often equal to the height of the lowercase x.