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The font-synthesis CSS property controls which missing typefaces, bold or italic, may be synthesized by the browser.

font-synthesis: none;
font-synthesis: weight;
font-synthesis: style;
font-synthesis: weight style;

/* Global values */
font-synthesis: initial;
font-synthesis: inherit;
font-synthesis: unset;

Most standard Western fonts include italic and bold variants, but many novelty fonts do not. Fonts used for Chinese, Japanese, Korean and other logographic scripts tend not to include these variants, and synthesizing them may impede the legibility of the text. In these cases, it may be desirable to switch off the browser's default font-synthesis.

Initial valueweight style
Applies toall elements. It also applies to ::first-letter and ::first-line.
Inheritedyes
Mediavisual
Computed valueas specified
Animation typediscrete
Canonical orderorder of appearance in the formal grammar of the values

Syntax

This property can take any one of the following forms:

  • the keyword value none
  • either of the keyword values weight and style
  • both the keyword values weight and style.

Values

none
This keyword indicates that neither bold nor italic typeface may be synthesized.
weight
This keyword indicates that a bold typeface may be synthesized if needed.
style
This keyword indicates that an italic typeface may be synthesized if needed.

Formal syntax

none | [ weight || style ]

Examples

HTML

<em class="syn">Synthesize me! 站直。</em>
<br/>
<em class="no-syn">Don't synthesize me! 站直。</em>

CSS

em {
  font-weight: bold;
}
.syn {
  font-synthesis: style weight;
}
.no-syn {
  font-synthesis: none;
}

Result

Specifications

Specification Status Comment
CSS Fonts Module Level 3
The definition of 'font-synthesis' in that specification.
Candidate Recommendation Initial definition

Browser Compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung Internet
Basic support
Experimental
Chrome No support NoEdge No support NoFirefox Full support 34
Full support 34
No support 33 — 34
Disabled
Disabled From version 33 until version 34 (exclusive): this feature is behind the layout.css.font-features.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
IE No support NoOpera No support NoSafari Full support 9WebView Android No support NoChrome Android No support NoEdge Mobile No support NoFirefox Android Full support 34Opera Android No support NoSafari iOS Full support 9.1Samsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
User must explicitly enable this feature.
User must explicitly enable this feature.

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Mitwirkende an dieser Seite: fscholz, wbamberg, y6nH, clagnut, duncanmcdonald, Sebastianz, xfq, teoli
Zuletzt aktualisiert von: fscholz,