Rebeccapurple is a color.
Rebeccapurple contains 33.33% red, 16.67% green, and 50% blue in RGB.
In CMYK, Rebeccapurple contains 33% cyan, 67% magenta, 0% yellow, and 40% black.
The namesake of this color is actually very sad, it was named after web design consultant Eric A. Meyer's daughter Rebecca, who died on her sixth birthday.
Here are some examples for using this color in CSS with Hex, RGB, HSL etc.