1. canvasgradient api: addcolorstop

  2. css property: stop-color

  3. types: `calc()`: gradient color stops support

  4. types: `<gradient>`: `conic-gradient()`: double-position color stops

  5. types: `<gradient>`: `conic-gradient()`: single color stop and 0-1 positions

  6. types: `<gradient>`: `linear-gradient()`: double-position color stops

  7. types: `<gradient>`: `linear-gradient()`: single color stop and 0-1 positions

  8. types: `<gradient>`: `radial-gradient()`: double-position color stops

  9. types: `<gradient>`: `radial-gradient()`: single color stop and 0-1 positions

  10. types: `<gradient>`: `repeating-conic-gradient()`: single color stop and 0-1 positions

  11. types: `<gradient>`: `repeating-linear-gradient()`: double-position color stops

  12. types: `<gradient>`: `repeating-linear-gradient()`: single color stop and 0-1 positions

  13. types: `<gradient>`: `repeating-radial-gradient()`: double-position color stops

  14. types: `<gradient>`: `repeating-radial-gradient()`: single color stop and 0-1 positions

  15. global_attributes: stop-color