Angle values in CSS have three possible units. All values in this example represent a right angle:

• 90deg (degrees)
• 100grad (grads)    One full circle (360deg) is 400grad
• 1.571rad (radians)   One full circle (360deg) is 2π radians, 1rad is 180/π degrees

• 1turn (turns) One full circle (360deg is 1turn)

Angle values may be negative. For example, -10deg and 350deg are equivalent. Values greater than 360deg are allowed.

Like for <length>, the unit may be omitted, if the value is zero: 0deg may be written as 0.