-interpolation-method)
    11. [ <color> ](/en-US/docs/Web/CSS/color_value)
    12. [ <custom-ident> ](/en-US/docs/Web/CSS/custom-ident)
    13. [ <dashed-ident> ](/en-US/docs/Web/CSS/dashed-ident)
    14. [ <dimension> ](/en-US/docs/Web/CSS/dimension)
    15. [ <display-box> ](/en-US/docs/Web/CSS/display-box)
    16. [ <display-inside> ](/en-US/docs/Web/CSS/display-inside)
    17. [ <display-internal> ](/en-US/docs/Web/CSS/display-internal)
    18. [ <display-legacy> ](/en-US/docs/Web/CSS/display-legacy)
    19. [ <display-listitem> ](/en-US/docs/Web/CSS/display-listitem)
    20. [ <display-outside> ](/en-US/docs/Web/CSS/display-outside)
    21. [ <easing-function> ](/en-US/docs/Web/CSS/easing-function)
    22. [ <filter-function> ](/en-US/docs/Web/CSS/filter-function)
    23. [ <flex> ](/en-US/docs/Web/CSS/flex_value)
    24. [ <frequency> ](/en-US/docs/Web/CSS/frequency)
    25. [ <frequency-percentage> ](/en-US/docs/Web/CSS/frequency-percentage)
    26. [ <generic-family> ](/en-US/docs/Web/CSS/generic-family)
    27. [ <gradient> ](/en-US/docs/Web/CSS/gradient)
    28. [ <hex-color> ](/en-US/docs/Web/CSS/hex-color)
    29. [ <hue> ](/en-US/docs/Web/CSS/hue)
    30. [ <hue-interpolation-method> ](/en-US/docs/Web/CSS/hue-interpolation-method)
    31. [ <ident> ](/en-US/docs/Web/CSS/ident)
    32. [ <image> ](/en-US/docs/Web/CSS/image)
    33. [ <integer> ](/en-US/docs/Web/CSS/integer)
    34. [ <length> ](/en-US/docs/Web/CSS/length)
    35. [ <length-percentage> ](/en-US/docs/Web/CSS/length-percentage)
    36. [ <line-style> ](/en-US/docs/Web/CSS/line-style)
    37. [ <named-color> ](/en-US/docs/Web/CSS/named-color)
    38. [ <number> ](/en-US/docs/Web/CSS/number)
    39. [ <overflow> ](/en-US/docs/Web/CSS/overflow_value)
    40. [ <percentage> ](/en-US/docs/Web/CSS/percentage)
    41. [ <position> ](/en-US/docs/Web/CSS/position_value)
    42. [ <ratio> ](/en-US/docs/Web/CSS/ratio)
    43. [ <relative-size> ](/en-US/docs/Web/CSS/relative-size)
    44. [ <resolution> ](/en-US/docs/Web/CSS/resolution)
    45. [ <shape> ](/en-US/docs/Web/CSS/shape) Deprecated 
    46. [ <string> ](/en-US/docs/Web/CSS/string)
    47. [ <system-color> ](/en-US/docs/Web/CSS/system-color)
    48. [ <time> ](/en-US/docs/Web/CSS/time)
    49. [ <time-percentage> ](/en-US/docs/Web/CSS/time-percentage)
    50. [ <transform-function> ](/en-US/docs/Web/CSS/transform-function)
  18. **Guides**
  19. Animations 
    1. [ Using CSS animations ](/en-US/docs/Web/CSS/CSS_animations/Using_CSS_animations)
  20. Backgrounds and Borders 
    1. [ Using multiple backgrounds ](/en-US/docs/Web/CSS/CSS_backgrounds_and_borders/Using_multiple_backgrounds)
    2. [ Resizing background images ](/en-US/docs/Web/CSS/CSS_backgrounds_and_borders/Resizing_background_images)
  21. Box alignment 
    1. [ Box alignment in block layout ](/en-US/docs/Web/CSS/CSS_box_alignment/Box_alignment_in_block_abspos_tables)
    2. [ Box alignment in flexbox ](/en-US/docs/Web/CSS/CSS_box_alignment/Box_alignment_in_flexbox)
    3. [ Box alignment in grid layout ](/en-US/docs/Web/CSS/CSS_box_alignment/Box_alignment_in_grid_layout)
    4. [ Box alignment in multi-column layout ](/en-US/docs/Web/CSS/CSS_box_alignment/Box_alignment_in_multi-column_layout)
  22. Box model 
    1. [ Introduction to the CSS basic box model ](/en-US/docs/Web/CSS/CSS_box_model/Introduction_to_the_CSS_box_model)
    2. [ Mastering margin collapsing ](/en-US/docs/Web/CSS/CSS_box_model/Mastering_margin_collapsing)
  23. Colors 
    1. [ Applying color to HTML elements using CSS ](/en-US/docs/Web/CSS/CSS_colors/Applying_color)
    2. [ Web Accessibility: Understanding colors and luminance ](/en-US/docs/Web/Accessibility/Understanding_Colors_and_Luminance)
    3. [ Web Accessibility: Color contrast ](/en-US/docs/Web/Accessibility/Understanding_WCAG/Perceivable/Color_contrast)
  24. Columns 
    1. [ Basic concepts of Multicol ](/en-US/docs/Web/CSS/CSS_multicol_layout/Basic_concepts)
    2. [ Styling columns ](/en-US/docs/We