font-weight Redirect 1

Summary

The font-weight CSS property specifies the weight or boldness of the font. However, some fonts are not available in all weights; some are available only on normal and bold.

  • Initial value normal
  • Applies to all elements
  • Inherited yes
  • Media visual
  • Computed value the keyword or the numerical value as specified, with bolder and lighter transformed to the real value
  • Animatable yes, as a font weight
  • Canonical order the unique non-ambiguous order defined by the formal grammar

Syntax

Formal syntax: normal | bold | bolder | lighter | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 | 900
font-weight: normal
font-weight: bold

font-weight: lighter
font-weight: bolder

font-weight: 100
font-weight: 200
font-weight: 300
font-weight: 400
font-weight: 500
font-weight: 600
font-weight: 700
font-weight: 800
font-weight: 900

font-weight: inherit

Values

normal
Normal font weight. Same as 400.
bold
Bold font weight. Same as 700.
lighter
One font weight lighter than the parent element (among the available weights of the font).
bolder
One font weight darker than the parent element (among the available weights of the font).
100, 200, 300, 400, 500, 600, 700, 800, 900
Numeric font weights for fonts that provide more than just normal and bold. If the exact weight given is unavailable, then 600-900 use the closest available darker weight (or, if there is none, the closest available lighter weight), and 100-500 use the closest available lighter weight (or, if there is none, the closest available darker weight). This means that for fonts that provide only normal and bold, 100-500 are normal, and 600-900 are bold.

Interpolation

A font-weight value is interpolated via discrete steps (multiples of 100). The interpolation happens in real number space and is converted to an integer by rounding to the nearest multiple of 100, with values halfway between multiples of 100 rounded towards positive infinity.

Examples

View the live example

/* Set paragraph text to be bold. */
p { font-weight: bold; }

/* Set h1 (level 1 heading) text to one step darker than
   normal but less than a standard bold. */
h1 { font-weight: 500; }

/* Sets text enclosed within span tag to be one step lighter
   than the parent. */
span { font-weight: lighter; }

Specifications

Specification Status Comment
CSS Fonts Module Level 3 Candidate Recommendation No change.
CSS Transitions Working Draft Defines font-weight as animatable.
CSS Level 2 (Revision 1) Recommendation No change.
CSS Level 1 Recommendation  

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 2.0 1.0 (1.7 or earlier) 3.0 3.5 1.3
Feature Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support 1.0 1.0 (1.0) 6.0 6.0 3.1

See also

Document Tags and Contributors

Contributors to this page: Sheppy
Last updated by: Sheppy,
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