The blog post explores various color models in CSS, both existing and upcoming, as part of the CSS Color Module Level 4, discussing their properties and appropriate applications. It begins with the RGB model, which is an additive color model widely used for its ubiquity and compatibility with computer systems but criticized for its lack of legibility. The HSL model, introduced in CSS3, offers a more intuitive approach for color manipulation but struggles with lightness representation. The HWB model provides a simplified alternative with intuitive user input, while the LCH and Lab models, using CIE lightness, address the inconsistencies of lightness perception in HSL. Additionally, the gray() notation for grayscale colors and the CMYK model for print media are discussed, with CMYK serving as a subtractive model ideal for print stylesheets. The post emphasizes the advantages of each model in various contexts, highlighting the bright future of color handling in CSS.