# differentiate CSS3 from CSS? CSS3 to handle media queries for responsive web design, which is not possible with CSS. You can use CSS3 for different browsers; CSS doesn’t support varied browsers. CSS3 is laced with several new features in a combinator, selectors, pseudo-elements and style properties. You can use new colors like RGBA, HSLA and HSL with CSS3. CSS--- 1- CSS Does not support responsive design. 2- CSS Slower compared to CSS3. 3- CSS Does not support media queries. 4- CSS Not supported by all types of modern browsers. 5- Requires manual development of rounded gradients and corners. 6- No special effects like shadowing text or text animation; CSS3--- 1- support responsive design. 2- Faster than CSS. 3- support media queries. 4- supported by all types of modern browsers. 5- Provides advanced codes for setting rounded gradients and corners. 6- Supports text shadow or text animation;