Non-standard
This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

The font-smooth CSS property controls the application of anti-aliasing when fonts are rendered.

Initial value auto
Applies to all elements and generated content
Inherited yes
Percentages relative to parent element's font size
Media visual
Computed value as specified

Syntax

/* Keyword values */
font-smooth: auto;
font-smooth: never;
font-smooth: always;

/* <length> value */
font-smooth: 2em;

WebKit implements a similar property, but with different values: -webkit-font-smoothing. It only works on Mac OS X/macOS.

  • auto - Let the browser decide (Uses subpixel anti-aliasing when available; this is the default)
  • none - Turn font smoothing off; display text with jagged sharp edges.
  • antialiased - Smooth the font on the level of the pixel, as opposed to the subpixel. Switching from subpixel rendering to antialiasing for light text on dark backgrounds makes it look lighter.
  • subpixel-antialiased - On most non-retina displays, this will give the sharpest text.

Firefox implements a similar property, but with different values: -moz-osx-font-smoothing. It only works on Mac OS X/macOS.

  • auto - Allow the browser to select an optimization for font smoothing, typically grayscale.
  • grayscale - Render text with grayscale antialiasing, as opposed to the subpixel. Switching from subpixel rendering to antialiasing for light text on dark backgrounds makes it look lighter.

Specifications

Though present in early (2002) drafts of CSS3 Fonts, font-smooth was removed and this specification is not on the standards track.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support5 -webkit- ?25 -moz-osx- 1 No Yes -webkit- 4 -webkit- 2
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes -webkit- Yes -webkit- ? ? Yes -webkit- ? ?

1. Only works on MacOS X / macOS.

2. Only works on Mac OS X/macOS.

See also

Document Tags and Contributors

Last updated by: fscholz,