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CSS has the following functions:
| Function | Description | CSS version |
|---|---|---|
| attr() | Returns the attribute value of the selected element. | 2 |
| calc() | Allows calculation of CSS attribute values, such as dynamically calculating length values. | 3 |
| cubic-bezier() | Defined a cubic Bezier curve. | 3 |
| hsl() | Define colors using hue, saturation, and brightness. | 3 |
| hsla() | Define colors using hue, saturation, brightness, and opacity. | 3 |
| linear-gradient() | Create an image with a linear gradient | 3 |
| radial-gradient() | Creates images with radial gradients. | 3 |
| repeating-linear-gradient() | Creates images with repeated linear gradients. | 3 |
| repeating-radial-gradient() | Similar to radial-gradient(), creates images with repeated radial gradients. | 3 |
| rgb() | Use the superposition of red (R), green (G), blue (B) to generate various colors. | 2 |
| rgba() | Use the superposition of red (R), green (G), blue (B), and opacity (A) to generate various colors. | 3 |
| var() | Used to insert custom attribute values. | 3 |