RRGGBBAA

RRGGBBAA refers to an eight-digit hexadecimal color notation that encodes red, green, blue, and alpha channels in that order. The digits are arranged as RR GG BB AA, with each pair representing an 8-bit value from 00 to FF (0 to 255).

The first three pairs specify the red, green, and blue color components in the standard sRGB color space, while the final pair AA encodes the alpha channel, which controls transparency. An alpha value of 00 means fully transparent, while FF means fully opaque.

RRGGBBAA is supported in contexts that implement CSS Color Level 4 (and later), notably many modern web browsers. It allows expressing color and transparency in a single hex token, for example #11223344 (red 0x11 = 17, green 0x22 = 34, blue 0x33 = 51, alpha 0x44 = 68).

To convert to the rgba() form used for non-hex notation, interpret R, G, B as decimal 0–255 and set A to AA/255 (for example, 0x44/255 ≈ 0.2667). Thus #11223344 corresponds to rgba(17, 34, 51, 0.2667).

Not all environments recognize eight-digit hex colors; some APIs and legacy tools expect different orders, such as ARGB or AARRGGBB. When using RRGGBBAA, verify support in the target renderer and consult relevant specifications for exact syntax.