Many people are waiting for CSS4 to come out. Where is it? When will it arrive? The answer is never. CSS4 will never happen. It's not actually a thing. Jen explains how CSS continues to evolve, with lots of new features shipping, but none of them under a giant “CSS4” banner. The master list of all the official CSS, currently: https://www.w3.org/Style/CSS/current-work CSS1: https://www.w3.org/TR/REC-CSS1-961217 CSS2: https://www.w3.org/TR/CSS21/ CSS Borders & Backgrounds 3: https://www.w3.org/TR/css-backgrounds-3/ CSS Color 3: https://www.w3.org/TR/css-color-3/ CSS Flexbox 1: https://www.w3.org/TR/css-flexbox-1/ CSS Fonts 3: https://www.w3.org/TR/css-fonts-3/ CSS Fonts 4: https://www.w3.org/TR/css-fonts-4/ CSS Grid 1: https://www.w3.org/TR/css-grid-1/ CSS Grid 2: https://www.w3.org/TR/css-grid-2/