​KembaraXtra-Computer Terms – browser CLUT:
A browser CLUT (Color Look-Up Table) is a predefined set of 216 colors considered safe for display across most web browsers and operating systems. These colors are chosen to ensure consistent appearance regardless of platform.
Using this color set helps web designers avoid color distortion or mismatches when content is viewed on different systems. It was especially important in earlier computing environments with limited color support.