Font-weight - CSS: Cascading Style Sheets - MDN Web Docs

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  1. References
  2. CSS
  3. font-weight
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  • Try it
  • Syntax
  • Accessibility
  • Formal definition
  • Formal syntax
  • Examples
  • Specifications
  • Browser compatibility
  • See also
  1. CSS
  2. Beginner's tutorials
  3. Your first website: Styling the content
  4. CSS styling basics
    1. What is CSS?
    2. Getting started with CSS
    3. Challenge: Styling a biography page
    4. Basic CSS selectors
    5. Attribute selectors
    6. Pseudo-classes and pseudo-elements
    7. Combinators
    8. The box model
    9. Handling conflicts
    10. CSS values and units
    11. Sizing items in CSS
    12. Backgrounds and borders
    13. Overflowing content
    14. Images, media, and form elements
    15. Styling tables
    16. Debugging CSS
    17. Challenge: Fundamental CSS comprehension
    18. Challenge: Creating fancy letterheaded paper
    19. Challenge: A cool-looking box
  5. CSS text styling
    1. Fundamental text and font styling
    2. Styling lists
    3. Styling links
    4. Web fonts
    5. Challenge: Typesetting a community school homepage
  6. CSS layout
    1. Introduction to CSS layout
    2. Floats
    3. Positioning
    4. Flexbox
    5. CSS grid layout
    6. Responsive design
    7. Media query fundamentals
    8. Challenge: Fundamental layout comprehension
  7. CSS reference
  8. Modules
    1. CSS anchor positioning
    2. CSS animations
    3. CSS backgrounds and borders
    4. CSS basic user interface
    5. CSS box alignment
    6. CSS box model
    7. CSS box sizing
    8. CSS cascade and inheritance
    9. CSS color adjustment
    10. CSS colors
    11. CSS compositing and blending
    12. CSS conditional rules
    13. CSS containment
    14. CSS counter styles
    15. CSS custom properties for cascading variables
    16. CSS display
    17. CSS filter effects
    18. CSS flexible box layout
    19. CSS font loading
    20. CSS fonts
    21. CSS fragmentation
    22. CSS generated content
    23. CSS grid layout
    24. CSS images
    25. CSS inline layout
    26. CSS lists and counters
    27. CSS logical properties and values
    28. CSS masking
    29. CSS media queries
    30. CSS motion path
    31. CSS multi-column layout
    32. CSS namespaces
    33. CSS nesting
    34. CSS overflow
    35. CSS overscroll behavior
    36. CSS paged media
    37. CSS positioned layout
    38. CSS properties and values API
    39. CSS pseudo-elements
    40. CSS ruby layout
    41. CSS scoping
    42. CSS scroll snap
    43. CSS scroll-driven animations
    44. CSS scrollbars styling
    45. CSS selectors
    46. CSS shadow parts
    47. CSS shapes
    48. CSS syntax
    49. CSS table
    50. CSS text
    51. CSS text decoration
    52. CSS transforms
    53. CSS transitions
    54. CSS view transitions
    55. CSS writing modes
    56. CSSOM view
  9. Properties
    1. -moz-*
      1. -moz-float-edge Non-standard Deprecated
      2. -moz-force-broken-image-icon Non-standard Deprecated
      3. -moz-image-region Non-standard
      4. -moz-orient Non-standard
      5. -moz-user-focus Non-standard Deprecated
      6. -moz-user-input Non-standard Deprecated
    2. -webkit-*
      1. -webkit-border-before Non-standard
      2. -webkit-box-reflect Non-standard
      3. -webkit-line-clamp
      4. -webkit-mask-box-image Non-standard
      5. -webkit-mask-composite Non-standard
      6. -webkit-mask-position-x Non-standard
      7. -webkit-mask-position-y Non-standard
      8. -webkit-mask-repeat-x Non-standard
      9. -webkit-mask-repeat-y Non-standard
      10. -webkit-tap-highlight-color Non-standard
      11. -webkit-text-fill-color
      12. -webkit-text-security Non-standard
      13. -webkit-text-stroke
      14. -webkit-text-stroke-color
      15. -webkit-text-stroke-width
      16. -webkit-touch-callout Non-standard
    3. accent-color
    4. align-*
      1. align-content
      2. align-items
      3. align-self
    5. all
    6. anchor-name Experimental
    7. animation-*
      1. animation
      2. animation-composition
      3. animation-delay
      4. animation-direction
      5. animation-duration
      6. animation-fill-mode
      7. animation-iteration-count
      8. animation-name
      9. animation-play-state
      10. animation-range Experimental
      11. animation-range-end Experimental
      12. animation-range-start Experimental
      13. animation-timeline Experimental
      14. animation-timing-function
    8. appearance
    9. aspect-ratio
    10. backdrop-filter
    11. backface-visibility
    12. background-*
      1. background
      2. background-attachment
      3. background-blend-mode
      4. background-clip
      5. background-color
      6. background-image
      7. background-origin
      8. background-position
      9. background-position-x
      10. background-position-y
      11. background-repeat
      12. background-size
    13. block-size
    14. border-*
      1. border
      2. border-block
      3. border-block-color
      4. border-block-end
      5. border-block-end-color
      6. border-block-end-style
      7. border-block-end-width
      8. border-block-start
      9. border-block-start-color
      10. border-block-start-style
      11. border-block-start-width
      12. border-block-style
      13. border-block-width
      14. border-bottom
      15. border-bottom-color
      16. border-bottom-left-radius
      17. border-bottom-right-radius
      18. border-bottom-style
      19. border-bottom-width
      20. border-collapse
      21. border-color
      22. border-end-end-radius
      23. border-end-start-radius
      24. border-image
      25. border-image-outset
      26. border-image-repeat
      27. border-image-slice
      28. border-image-source
      29. border-image-width
      30. border-inline
      31. border-inline-color
      32. border-inline-end
      33. border-inline-end-color
      34. border-inline-end-style
      35. border-inline-end-width
      36. border-inline-start
      37. border-inline-start-color
      38. border-inline-start-style
      39. border-inline-start-width
      40. border-inline-style
      41. border-inline-width
      42. border-left
      43. border-left-color
      44. border-left-style
      45. border-left-width
      46. border-radius
      47. border-right
      48. border-right-color
      49. border-right-style
      50. border-right-width
      51. border-spacing
      52. border-start-end-radius
      53. border-start-start-radius
      54. border-style
      55. border-top
      56. border-top-color
      57. border-top-left-radius
      58. border-top-right-radius
      59. border-top-style
      60. border-top-width
      61. border-width
    15. bottom
    16. box-*
      1. box-align Non-standard Deprecated
      2. box-decoration-break
      3. box-direction Non-standard Deprecated
      4. box-flex Non-standard Deprecated
      5. box-flex-group Non-standard Deprecated
      6. box-lines Non-standard Deprecated
      7. box-ordinal-group Non-standard Deprecated
      8. box-orient Non-standard Deprecated
      9. box-pack Non-standard Deprecated
      10. box-shadow
      11. box-sizing
    17. break-*
      1. break-after
      2. break-before
      3. break-inside
    18. caption-side
    19. caret-color
    20. clear
    21. clip-*
      1. clip Deprecated
      2. clip-path
      3. clip-rule
    22. color-*
      1. color
      2. color-interpolation
      3. color-interpolation-filters
      4. color-scheme
    23. column-*
      1. column-count
      2. column-fill
      3. column-gap
      4. column-rule
      5. column-rule-color
      6. column-rule-style
      7. column-rule-width
      8. column-span
      9. column-width
    24. columns
    25. contain-*
      1. contain
      2. contain-intrinsic-block-size
      3. contain-intrinsic-height
      4. contain-intrinsic-inline-size
      5. contain-intrinsic-size
      6. contain-intrinsic-width
    26. container-*
      1. container
      2. container-name
      3. container-type
    27. content
    28. content-visibility
    29. counter-*
      1. counter-increment
      2. counter-reset
      3. counter-set
    30. cursor
    31. cx
    32. cy
    33. d
    34. direction
    35. display
    36. dominant-baseline
    37. empty-cells
    38. field-sizing Experimental
    39. fill-*
      1. fill
      2. fill-opacity
      3. fill-rule
    40. filter
    41. flex-*
      1. flex
      2. flex-basis
      3. flex-direction
      4. flex-flow
      5. flex-grow
      6. flex-shrink
      7. flex-wrap
    42. float
    43. flood-color
    44. flood-opacity
    45. font-*
      1. font
      2. font-family
      3. font-feature-settings
      4. font-kerning
      5. font-language-override
      6. font-optical-sizing
      7. font-palette
      8. font-size
      9. font-size-adjust
      10. font-smooth Non-standard
      11. font-stretch
      12. font-style
      13. font-synthesis
      14. font-synthesis-position Experimental
      15. font-synthesis-small-caps
      16. font-synthesis-style
      17. font-synthesis-weight
      18. font-variant
      19. font-variant-alternates
      20. font-variant-caps
      21. font-variant-east-asian
      22. font-variant-emoji
      23. font-variant-ligatures
      24. font-variant-numeric
      25. font-variant-position
      26. font-variation-settings
      27. font-weight
    46. forced-color-adjust
    47. gap
    48. grid-*
      1. grid
      2. grid-area
      3. grid-auto-columns
      4. grid-auto-flow
      5. grid-auto-rows
      6. grid-column
      7. grid-column-end
      8. grid-column-start
      9. grid-row
      10. grid-row-end
      11. grid-row-start
      12. grid-template
      13. grid-template-areas
      14. grid-template-columns
      15. grid-template-rows
    49. hanging-punctuation
    50. height
    51. hyphenate-character
    52. hyphenate-limit-chars
    53. hyphens
    54. image-*
      1. image-orientation
      2. image-rendering
      3. image-resolution Experimental
    55. initial-letter
    56. inline-size
    57. inset-*
      1. inset
      2. inset-block
      3. inset-block-end
      4. inset-block-start
      5. inset-inline
      6. inset-inline-end
      7. inset-inline-start
    58. interpolate-size Experimental
    59. isolation
    60. justify-*
      1. justify-content
      2. justify-items
      3. justify-self
    61. left
    62. letter-spacing
    63. lighting-color
    64. line-*
      1. line-break
      2. line-height
      3. line-height-step Experimental
    65. list-*
      1. list-style
      2. list-style-image
      3. list-style-position
      4. list-style-type
    66. margin-*
      1. margin
      2. margin-block
      3. margin-block-end
      4. margin-block-start
      5. margin-bottom
      6. margin-inline
      7. margin-inline-end
      8. margin-inline-start
      9. margin-left
      10. margin-right
      11. margin-top
      12. margin-trim Experimental
    67. marker-*
      1. marker
      2. marker-end
      3. marker-mid
      4. marker-start
    68. mask-*
      1. mask
      2. mask-border
      3. mask-border-mode
      4. mask-border-outset
      5. mask-border-repeat
      6. mask-border-slice
      7. mask-border-source
      8. mask-border-width
      9. mask-clip
      10. mask-composite
      11. mask-image
      12. mask-mode
      13. mask-origin
      14. mask-position
      15. mask-repeat
      16. mask-size
      17. mask-type
    69. math-*
      1. math-depth
      2. math-shift Experimental
      3. math-style
    70. max-*
      1. max-block-size
      2. max-height
      3. max-inline-size
      4. max-width
    71. min-*
      1. min-block-size
      2. min-height
      3. min-inline-size
      4. min-width
    72. mix-blend-mode
    73. object-fit
    74. object-position
    75. offset-*
      1. offset
      2. offset-anchor
      3. offset-distance
      4. offset-path
      5. offset-position
      6. offset-rotate
    76. opacity
    77. order
    78. orphans
    79. outline-*
      1. outline
      2. outline-color
      3. outline-offset
      4. outline-style
      5. outline-width
    80. overflow-*
      1. overflow
      2. overflow-anchor
      3. overflow-block
      4. overflow-clip-margin
      5. overflow-inline
      6. overflow-wrap
      7. overflow-x
      8. overflow-y
    81. overlay Experimental
    82. overscroll-*
      1. overscroll-behavior
      2. overscroll-behavior-block
      3. overscroll-behavior-inline
      4. overscroll-behavior-x
      5. overscroll-behavior-y
    83. padding-*
      1. padding
      2. padding-block
      3. padding-block-end
      4. padding-block-start
      5. padding-bottom
      6. padding-inline
      7. padding-inline-end
      8. padding-inline-start
      9. padding-left
      10. padding-right
      11. padding-top
    84. page-*
      1. page
      2. page-break-after
      3. page-break-before
      4. page-break-inside
    85. paint-order
    86. perspective
    87. perspective-origin
    88. place-*
      1. place-content
      2. place-items
      3. place-self
    89. pointer-events
    90. position-*
      1. position
      2. position-anchor Experimental
      3. position-area Experimental
      4. position-try Experimental
      5. position-try-fallbacks Experimental
      6. position-try-order Experimental
      7. position-visibility Experimental
    91. print-color-adjust
    92. quotes
    93. r
    94. resize
    95. right
    96. rotate
    97. row-gap
    98. ruby-align
    99. ruby-position
    100. rx
    101. ry
    102. scale
    103. scroll-*
      1. scroll-behavior
      2. scroll-margin
      3. scroll-margin-block
      4. scroll-margin-block-end
      5. scroll-margin-block-start
      6. scroll-margin-bottom
      7. scroll-margin-inline
      8. scroll-margin-inline-end
      9. scroll-margin-inline-start
      10. scroll-margin-left
      11. scroll-margin-right
      12. scroll-margin-top
      13. scroll-padding
      14. scroll-padding-block
      15. scroll-padding-block-end
      16. scroll-padding-block-start
      17. scroll-padding-bottom
      18. scroll-padding-inline
      19. scroll-padding-inline-end
      20. scroll-padding-inline-start
      21. scroll-padding-left
      22. scroll-padding-right
      23. scroll-padding-top
      24. scroll-snap-align
      25. scroll-snap-stop
      26. scroll-snap-type
      27. scroll-timeline Experimental
      28. scroll-timeline-axis Experimental
      29. scroll-timeline-name Experimental
    104. scrollbar-*
      1. scrollbar-color
      2. scrollbar-gutter
      3. scrollbar-width
    105. shape-*
      1. shape-image-threshold
      2. shape-margin
      3. shape-outside
      4. shape-rendering
    106. stop-color
    107. stop-opacity
    108. stroke-*
      1. stroke
      2. stroke-dasharray
      3. stroke-dashoffset
      4. stroke-linecap
      5. stroke-linejoin
      6. stroke-miterlimit
      7. stroke-opacity
      8. stroke-width
    109. tab-size
    110. table-layout
    111. text-*
      1. text-align
      2. text-align-last
      3. text-anchor
      4. text-combine-upright
      5. text-decoration
      6. text-decoration-color
      7. text-decoration-line
      8. text-decoration-skip Experimental
      9. text-decoration-skip-ink
      10. text-decoration-style
      11. text-decoration-thickness
      12. text-emphasis
      13. text-emphasis-color
      14. text-emphasis-position
      15. text-emphasis-style
      16. text-indent
      17. text-justify
      18. text-orientation
      19. text-overflow
      20. text-rendering
      21. text-shadow
      22. text-size-adjust Experimental
      23. text-spacing-trim Experimental
      24. text-transform
      25. text-underline-offset
      26. text-underline-position
      27. text-wrap
      28. text-wrap-mode
      29. text-wrap-style
    112. timeline-scope Experimental
    113. top
    114. touch-action
    115. transform-*
      1. transform
      2. transform-box
      3. transform-origin
      4. transform-style
    116. transition-*
      1. transition
      2. transition-behavior
      3. transition-delay
      4. transition-duration
      5. transition-property
      6. transition-timing-function
    117. translate
    118. unicode-bidi
    119. user-modify Non-standard Deprecated
    120. user-select
    121. vector-effect
    122. vertical-align
    123. view-*
      1. view-timeline Experimental
      2. view-timeline-axis Experimental
      3. view-timeline-inset Experimental
      4. view-timeline-name Experimental
      5. view-transition-name
    124. visibility
    125. white-space
    126. white-space-collapse
    127. widows
    128. width
    129. will-change
    130. word-break
    131. word-spacing
    132. writing-mode
    133. x
    134. y
    135. z-index
    136. zoom
  10. Selectors
    1. & nesting selector
    2. Attribute selectors
    3. Class selectors
    4. ID selectors
    5. Type selectors
    6. Universal selectors
  11. Combinators
    1. Child combinator
    2. Column combinator Experimental
    3. Descendant combinator
    4. Namespace separator
    5. Next-sibling combinator
    6. Selector list
    7. Subsequent-sibling combinator
  12. Pseudo-classes
    1. :-moz-broken Non-standard Deprecated
    2. :-moz-drag-over Non-standard
    3. :-moz-first-node Experimental Non-standard
    4. :-moz-handler-blocked Non-standard
    5. :-moz-handler-crashed Non-standard
    6. :-moz-handler-disabled Non-standard
    7. :-moz-last-node Experimental Non-standard
    8. :-moz-loading Non-standard
    9. :-moz-locale-dir(ltr) Non-standard
    10. :-moz-locale-dir(rtl) Non-standard
    11. :-moz-only-whitespace Non-standard
    12. :-moz-submit-invalid Non-standard
    13. :-moz-suppressed Non-standard
    14. :-moz-user-disabled Non-standard
    15. :-moz-window-inactive Non-standard
    16. :active
    17. :any-link
    18. :autofill
    19. :blank Experimental
    20. :buffering
    21. :checked
    22. :current Experimental
    23. :default
    24. :defined
    25. :dir()
    26. :disabled
    27. :empty
    28. :enabled
    29. :first
    30. :first-child
    31. :first-of-type
    32. :focus
    33. :focus-visible
    34. :focus-within
    35. :fullscreen
    36. :future
    37. :has-slotted Experimental
    38. :has()
    39. :host
    40. :host-context()
    41. :host()
    42. :hover
    43. :in-range
    44. :indeterminate
    45. :invalid
    46. :is()
    47. :lang()
    48. :last-child
    49. :last-of-type
    50. :left
    51. :link
    52. :local-link Experimental
    53. :modal
    54. :muted
    55. :not()
    56. :nth-child()
    57. :nth-last-child()
    58. :nth-last-of-type()
    59. :nth-of-type()
    60. :only-child
    61. :only-of-type
    62. :optional
    63. :out-of-range
    64. :past
    65. :paused
    66. :picture-in-picture
    67. :placeholder-shown
    68. :playing
    69. :popover-open
    70. :read-only
    71. :read-write
    72. :required
    73. :right
    74. :root
    75. :scope
    76. :seeking
    77. :stalled
    78. :state()
    79. :target
    80. :target-within Experimental
    81. :user-invalid
    82. :user-valid
    83. :valid
    84. :visited
    85. :volume-locked
    86. :where()
  13. Pseudo-elements
    1. ::-moz-color-swatch Non-standard
    2. ::-moz-focus-inner Experimental Non-standard
    3. ::-moz-list-bullet Experimental Non-standard
    4. ::-moz-list-number Experimental Non-standard
    5. ::-moz-meter-bar Non-standard
    6. ::-moz-progress-bar Experimental Non-standard
    7. ::-moz-range-progress Non-standard
    8. ::-moz-range-thumb Non-standard
    9. ::-moz-range-track Non-standard
    10. ::-webkit-inner-spin-button Non-standard
    11. ::-webkit-meter-bar Non-standard Deprecated
    12. ::-webkit-meter-even-less-good-value Non-standard
    13. ::-webkit-meter-inner-element Non-standard
    14. ::-webkit-meter-optimum-value Non-standard
    15. ::-webkit-meter-suboptimum-value Non-standard
    16. ::-webkit-progress-bar Non-standard
    17. ::-webkit-progress-inner-element Non-standard
    18. ::-webkit-progress-value Non-standard
    19. ::-webkit-scrollbar Non-standard
    20. ::-webkit-search-cancel-button Non-standard
    21. ::-webkit-search-results-button Non-standard
    22. ::-webkit-slider-runnable-track Experimental Non-standard
    23. ::-webkit-slider-thumb Experimental Non-standard
    24. ::after
    25. ::backdrop
    26. ::before
    27. ::cue
    28. ::details-content
    29. ::file-selector-button
    30. ::first-letter
    31. ::first-line
    32. ::grammar-error
    33. ::highlight()
    34. ::marker
    35. ::part()
    36. ::placeholder
    37. ::selection
    38. ::slotted()
    39. ::spelling-error
    40. ::target-text
    41. ::view-transition
    42. ::view-transition-group
    43. ::view-transition-image-pair
    44. ::view-transition-new
    45. ::view-transition-old
  14. At-rules
    1. @charset
    2. @color-profile
    3. @container
    4. @counter-style
    5. @document Non-standard Deprecated
    6. @font-face
    7. @font-feature-values
    8. @font-palette-values
    9. @import
    10. @keyframes
    11. @layer
    12. @media
    13. @namespace
    14. @page
    15. @position-try Experimental
    16. @property
    17. @scope
    18. @starting-style
    19. @supports
    20. @view-transition
  15. Functions
    1. -moz-image-rect Non-standard Deprecated
    2. abs()
    3. acos()
    4. anchor-size() Experimental
    5. anchor() Experimental
    6. asin()
    7. atan()
    8. atan2()
    9. attr()
    10. calc-size() Experimental
    11. calc()
    12. clamp()
    13. cos()
    14. counter()
    15. counters()
    16. cross-fade()
    17. element() Experimental
    18. env()
    19. exp()
    20. fit-content()
    21. hypot()
    22. log()
    23. max()
    24. min()
    25. minmax()
    26. mod()
    27. pow()
    28. ray()
    29. rem()
    30. repeat()
    31. round()
    32. sign()
    33. sin()
    34. sqrt()
    35. symbols()
    36. tan()
    37. url()
    38. var()
  16. Types
    1. <absolute-size>
    2. <alpha-value>
    3. <angle-percentage>
    4. <angle>
    5. <basic-shape>
    6. <blend-mode>
    7. <box-edge>
    8. <calc-keyword>
    9. <calc-sum>
    10. <color-interpolation-method>
    11. <color>
    12. <custom-ident>
    13. <dashed-ident>
    14. <dimension>
    15. <display-box>
    16. <display-inside>
    17. <display-internal>
    18. <display-legacy>
    19. <display-listitem>
    20. <display-outside>
    21. <easing-function>
    22. <filter-function>
    23. <flex>
    24. <frequency-percentage>
    25. <frequency>
    26. <generic-family>
    27. <gradient>
    28. <hex-color>
    29. <hue-interpolation-method>
    30. <hue>
    31. <ident>
    32. <image>
    33. <integer>
    34. <length-percentage>
    35. <length>
    36. <line-style>
    37. <named-color>
    38. <number>
    39. <overflow>
    40. <percentage>
    41. <position-area> Experimental
    42. <position>
    43. <ratio>
    44. <relative-size>
    45. <resolution>
    46. <shape> Deprecated
    47. <string>
    48. <system-color>
    49. <time-percentage>
    50. <time>
    51. <transform-function>
    52. <url>
  17. Guides
  18. Animations
    1. Using CSS animations
  19. Backgrounds and Borders
    1. Using multiple backgrounds
    2. Resizing background images
  20. Box alignment
    1. Box alignment in block layout
    2. Box alignment in flexbox
    3. Box alignment in grid layout
    4. Box alignment in multi-column layout
  21. Box model
    1. Introduction to the CSS basic box model
    2. Mastering margin collapsing
  22. Colors
    1. Applying_color_to_HTML_elements
    2. Color values
    3. Using relative colors
    4. Using color wisely
    5. Accessibility_Understanding_colors_and_luminance"
    6. Accessibility: Color contrast
  23. Columns
    1. Basic concepts of multi-column layout
    2. Styling columns
    3. Spanning and balancing columns
    4. Handling overflow in multi-column layout
    5. Handling content breaks in multi-column layout
  24. Conditional rules
    1. Using feature queries
  25. Containment
    1. Using CSS containment
    2. CSS container queries
    3. Using container size and style queries
  26. CSSOM view
    1. Coordinate systems
  27. Flexbox
    1. Basic concepts of flexbox
    2. Relationship of flexbox to other layout methods
    3. Aligning items in a flex container
    4. Ordering flex items
    5. Controlling ratios of flex items along the main axis
    6. Mastering wrapping of flex items
    7. Typical use cases of flexbox
  28. Flow layout
    1. Block and inline layout in normal flow
    2. In flow and out of flow
    3. Introduction to formatting contexts
    4. Flow layout and writing modes
    5. Flow layout and overflow
  29. Fonts
    1. OpenType font features guide
    2. Variable fonts guide
  30. Grid
    1. Basic concepts of grid layout
    2. Relationship of grid layout to other layout methods
    3. Grid layout using line-based placement
    4. Grid template areas
    5. Layout using named grid lines
    6. Auto-placement in grid layout
    7. Box alignment in grid layout
    8. Grids, logical values, and writing modes
    9. Grid layout and accessibility
    10. CSS grid layout and progressive enhancement
    11. Realizing common layouts using grids
    12. Subgrid
    13. Masonry layout Experimental
  31. Images
    1. Using CSS gradients
  32. Lists and counters
    1. Using CSS counters
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  33. Logical properties
    1. Basic concepts of logical properties and values
    2. Logical properties for floating and positioning
    3. Logical properties for margins, borders, and padding
    4. Logical properties for sizing
  34. Math functions
    1. Using CSS math functions
  35. Media queries
    1. Using media queries
    2. Using media queries for accessibility
    3. Testing media queries programmatically
    4. Printing
  36. Nesting style rules
    1. Using CSS nesting
    2. CSS nesting at-rules
    3. CSS nesting and specificity
  37. Positioning
    1. Understanding z-index
  38. Scroll snap
    1. Basic concepts of scroll snap
  39. Shapes
    1. Overview of shapes
    2. Shapes from box values
    3. Basic shapes with shape-outside
    4. Shapes from images
  40. Text
    1. Wrapping and breaking text
  41. Transforms
    1. Using CSS transforms
  42. Transitions
    1. Using CSS transitions
  43. CSS Layout cookbook
    1. Recipe: Media objects
    2. Column layouts
    3. Center an element
    4. Sticky footers
    5. Split navigation
    6. Breadcrumb navigation
    7. List group with badges
    8. Pagination
    9. Card
    10. Grid wrapper
  45. Tools
    1. Color picker tool
    2. Box-shadow generator
    3. Border-image generator
    4. Border-radius generator
  • Try it
  • Syntax
  • Accessibility
  • Formal definition
  • Formal syntax
  • Examples
  • Specifications
  • Browser compatibility
  • See also

The font-weight CSS property sets the weight (or boldness) of the font. The weights available depend on the font-family that is currently set.

Try it

Syntax

css/* <font-weight-absolute> keyword values */ font-weight: normal; font-weight: bold; /* <font-weight-absolute> numeric values [1,1000] */ font-weight: 100; font-weight: 200; font-weight: 300; font-weight: 400; /* normal */ font-weight: 500; font-weight: 600; font-weight: 700; /* bold */ font-weight: 800; font-weight: 900; /* Keyword values relative to the parent */ font-weight: lighter; font-weight: bolder; /* Global values */ font-weight: inherit; font-weight: initial; font-weight: revert; font-weight: revert-layer; font-weight: unset;

The font-weight property is specified using either a <font-weight-absolute> value or a relative weight value, as listed below.

Values

normal

Normal font weight. Same as 400.

bold

Bold font weight. Same as 700.

<number>

A <number> value between 1 and 1000, both values included. Higher numbers represent weights that are bolder than (or as bold as) lower numbers. This allows fine-grain control for variable fonts. For non-variable fonts, if the exact specified weight is unavailable, a fallback weight algorithm is used — numeric values that are divisible by 100 correspond to common weight names, as described in the Common weight name mapping section below.

lighter

One relative font weight lighter than the parent element. Note that only four font weights are considered for relative weight calculation; see the Meaning of relative weights section below.

bolder

One relative font weight heavier than the parent element. Note that only four font weights are considered for relative weight calculation; see the Meaning of relative weights section below.

Fallback weights

If the exact weight given is unavailable, then the following rule is used to determine the weight actually rendered:

  • If the target weight given is between 400 and 500 inclusive:

    • Look for available weights between the target and 500, in ascending order.
    • If no match is found, look for available weights less than the target, in descending order.
    • If no match is found, look for available weights greater than 500, in ascending order.

  • If a weight less than 400 is given, look for available weights less than the target, in descending order. If no match is found, look for available weights greater than the target, in ascending order.

  • If a weight greater than 500 is given, look for available weights greater than the target, in ascending order. If no match is found, look for available weights less than the target, in descending order.

Note: The fallback weight algorithm is only used for rendering. The computed value of the property is still the specified value.

Meaning of relative weights

When lighter or bolder is specified, the below chart shows how the absolute font weight of the element is determined.

Note that when using relative weights, only four font weights are considered — thin (100), normal (400), bold (700), and heavy (900). If a font family has more weights available, they are ignored for the purposes of relative weight calculation.

Inherited value bolder lighter
100 400 100
200 400 100
300 400 100
400 700 100
500 700 100
600 900 400
700 900 400
800 900 700
900 900 700

Common weight name mapping

The numerical values 100 to 900 roughly correspond to the following common weight names (see the OpenType specification):

Value Common weight name
100 Thin (Hairline)
200 Extra Light (Ultra Light)
300 Light
400 Normal (Regular)
500 Medium
600 Semi Bold (Demi Bold)
700 Bold
800 Extra Bold (Ultra Bold)
900 Black (Heavy)
950 Extra Black (Ultra Black)

Variable fonts

While many fonts have a particular weight corresponding to one of the numbers in Common weight name mapping, most variable fonts support a range of weights providing much finer granularity, giving designers and developers more control over the chosen weight.

For TrueType or OpenType variable fonts, the "wght" variation is used to implement varying widths.

This demo loads with font-weight: 500; set. Change the value of the font-weight property in the .sample selector to see the weight of the text change (e.g., 200, 700). Click "Play" in the code blocks below to edit the example in the MDN Playground:

html<p class="sample"> ...it would not be wonderful to meet a Megalosaurus, forty feet long or so, waddling like an elephantine lizard up Holborn Hill. </p> css@font-face { src: url("https://mdn.github.io/shared-assets/fonts/variable-fonts/MutatorSans.ttf"); font-family: "MutatorSans"; font-style: normal; font-weight: 1 1000; } .sample { text-transform: uppercase; font-weight: 500; font: 1.5rem "MutatorSans", sans-serif; }

Accessibility

People experiencing low vision conditions may have difficulty reading text set with a font-weight value of 100 (Thin/Hairline) or 200 (Extra Light), especially if the font has a low contrast color ratio.

  • MDN Understanding WCAG, Guideline 1.4 explanations
  • Understanding Success Criterion 1.4.8 | W3C Understanding WCAG 2.0

Formal definition

Initial valuenormal
Applies toall elements and text. It also applies to ::first-letter and ::first-line.
Inheritedyes
Computed valuethe keyword or the numerical value as specified, with bolder and lighter transformed to the real value
Animation typea font weight

Formal syntax

font-weight = <font-weight-absolute> | bolder | lighter <font-weight-absolute> = normal | bold | <number [1,1000]>

Examples

Setting font weights

HTML

html<p> Alice was beginning to get very tired of sitting by her sister on the bank, and of having nothing to do: once or twice she had peeped into the book her sister was reading, but it had no pictures or conversations in it, "and what is the use of a book," thought Alice "without pictures or conversations?" </p> <div> I'm heavy<br /> <span>I'm lighter</span> </div>

CSS

css/* Set paragraph text to be bold. */ p { font-weight: bold; } /* Set div text to two steps heavier than normal but less than a standard bold. */ div { font-weight: 600; } /* Set span text to be one step lighter than its parent. */ span { font-weight: lighter; }

Result

Specifications

Specification
CSS Fonts Module Level 4 # font-weight-prop

Browser compatibility

BCD tables only load in the browser

See also

  • font-family
  • font-style
  • Learn: Fundamental text and font styling
  • CSS fonts module

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