CssNumber

This unit represents the width, or more precisely the advance measure, of the glyph '0' zero, the Unicode character U+0030 in the element's font.

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One centimeter 10 millimeters.

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An angle in degrees. One full circle is 360deg. E.g. 0deg, 90deg, 360deg.

This unit represents the calculated font-size of the element. If used on the font-size property itself, it represents the inherited font-size of the element.

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This unit represents the x-height of the element's font. On fonts with the 'x' letter, this is generally the height of lowercase letters in the font; 1ex ≈ 0.5em in many fonts.

MDN

An angle in gradians. One full circle is 400grad. E.g. 0grad, 100grad, 400grad.

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One inch 2.54 centimeters.

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One millimeter.

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One pica which is 12 points.

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A percentage value

One point which is 1/72 of an inch.

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Relative to the viewing device. For screen display, typically one device pixel (dot) of the display.

For printers and very high resolution screens one CSS pixel implies multiple device pixels, so that the number of pixel per inch stays around 96.

MDN

An angle in radians. One full circle is 2π radians which approximates to 6.2832rad. 1rad is 180/π degrees. E.g. 0rad, 1.0708rad, 6.2832rad.

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This unit represents the font-size of the root element e.g. the font-size of the html element. When used on the font-size on this root element, it represents its initial value.

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The number of turns the angle is. One full circle is 1turn. E.g. 0turn, 0.25turn, 1turn.

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