hexcolor

Hex color refers to a color value expressed in hexadecimal notation, commonly used in web development. The standard form is #RRGGBB, where RR, GG, and BB are two-digit hexadecimal numbers representing the red, green, and blue components of a color in the sRGB color space. Each component ranges from 00 to FF (0 to 255), and the combination defines a specific color.

A three-digit shorthand is also supported in many contexts: #RGB expands to #RRGGBB by duplicating each digit (for example, #0F8 expands to #00FF88). In modern CSS, an eight-digit form is defined as #RRGGBBAA, where the last two digits AA encode the alpha transparency. A four-digit shorthand #RGBA is also recognized, expanding to #RRGGBBAA.

Examples: #ff0000 is red, #00ff00 is green, #0000ff is blue, #ffffff is white, and #000000 is black. The eight-digit form #11223344 encodes red=0x11, green=0x22, blue=0x33, alpha=0x44. Some tools display hex colors with uppercase or lowercase hex digits interchangeably.

Usage and compatibility: Hex colors are used in HTML style attributes and in CSS stylesheets, as well as in many programming frameworks that manipulate color. They are generally interpreted as sRGB values. For accessibility, authors should ensure sufficient contrast between foreground and background colors, as hex alone does not guarantee readability. Hex colors remain a standard representation in digital design and web development.