Pixels - 1/96th of an inch on screen

Points - 1/72nd of an inch (print)

Picas - 1pc = 12pt

Centimeters

Millimeters

Inches - 1in = 96px = 2.54cm

Quarter-millimeters - 1Q = 0.25mm

Relative to parent element font size (compounds when nested)

Relative to root element font size (consistent, does not compound)

Width of the "0" character in current font

Height of the "x" character in current font

Height of capital letters in current font

Width of the CJK water ideograph in current font

Line height of the element

Line height of the root element

1% of viewport width

1% of viewport height

1% of the smaller viewport dimension

1% of the larger viewport dimension

1% of small viewport width

1% of small viewport height

1% of large viewport width

1% of large viewport height

1% of dynamic viewport width

1% of dynamic viewport height (adjusts for mobile UI)

1% of query container width

1% of query container height

1% of query container inline size

1% of query container block size

1% of smaller query container dimension

1% of larger query container dimension

Percentage of parent element property value

Fractional unit for CSS Grid tracks

Degrees (angles: 0-360)

Radians (angles)

Turns (1turn = 360deg)

Gradians (400grad = 360deg)

Seconds (time)

Milliseconds (time)

Dots per inch (resolution)

Dots per centimeter (resolution)

Dots per pixel (resolution, 1dppx = 96dpi)