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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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support No No

34

33 — 341

No No9
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support No No No34 No9.1 No

1. 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.

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