font-stretch

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The font-stretch CSS descriptor allows authors to specify a normal, condensed, or expanded face for the fonts specified in the @font-face rule.

For a particular font family, authors can download various font faces which correspond to the different styles of the same font family, and then use the font-stretch descriptor to explicitly specify the font face's stretch. The values for the CSS descriptor is same as that of its corresponding font property.

Related at-rule@font-face
Initial valuenormal
Mediaall
Computed valueas specified
Canonical orderthe unique non-ambiguous order defined by the formal grammar

Syntax

/* Single values */
font-stretch: ultra-condensed;
font-stretch: extra-condensed;
font-stretch: condensed;
font-stretch: semi-condensed;
font-stretch: normal;
font-stretch: semi-expanded;
font-stretch: expanded;
font-stretch: extra-expanded;
font-stretch: ultra-expanded;
font-stretch: 50%;
font-stretch: 100%;
font-stretch: 200%;

/* multiple values */
font-stretch: 75% 125%;
font-stretch: condensed ultra-condensed;;

The font-weight property is described using any one of the values listed below.

Values

normal
Specifies a normal font face.
semi-condensed, condensed, extra-condensed, ultra-condensed
Specifies a more condensed font face than normal, with ultra-condensed as the most condensed.
semi-expanded, expanded, extra-expanded, ultra-expanded
Specifies a more expanded font face than normal, with ultra-expanded as the most expanded.
<percentage>
A <percentage> value between 50% and 200% (inclusive). Negative values are not allowed for this property.

In earlier versions of the font-stretch specification, the property accepts only the nine keyword values. CSS Fonts Level 4 extends the syntax to accept a <percentage> value as well. This enables variable fonts to offer something more like a continuum of character widths. For TrueType or OpenType variable fonts, the "wdth" variation is used to implement varying widths.

If the font does not provide a face that exactly matches the given value, then values less than 100% map to a narrower face, and values greater than or equal to 100% map to a wider face.

Keyword to numeric mapping

The table below shows the mapping between keyword values and numeric percentages:

Keyword Percentage
ultra-condensed 50%
extra-condensed 62.5%
condensed 75%
semi-condensed 87.5%
normal 100%
semi-expanded 112.5%
expanded 125%
extra-expanded 150%
ultra-expanded 200%

Variable fonts

Most fonts have a particular width which corresponds to one of the keyterm values. However some fonts, called variable fonts, can support a range of stretching with more or less fine granularity, and this can give the designer a much closer degree of control over the chosen weight. For this, percentage ranges are useful.

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

For the example below to work, you'll need a browser that supports the CSS Fonts Level 4 syntax in which font-weight can be any number between 1 and 1000.

Formal syntax

<font-stretch-absolute>{1,2}

where
<font-stretch-absolute> = normal | ultra-condensed | extra-condensed | condensed | semi-condensed | semi-expanded | expanded | extra-expanded | ultra-expanded | <percentage>

Examples

The following find a local Open Sans font or import it, and allow using the font for normal, semi-condensed and semi-expanded states.

@font-face {
  font-family: "Open Sans";
  src: local("Open Sans") format("woff2"),
       url("/fonts/OpenSans-Regular-webfont.woff") format("woff");
  font-stretch: 87.5% 112.5%;
}

Accessibility concerns

People with dyslexia and other cognitive conditions may have difficulty reading fonts that are too condensed, especially if the font has a low contrast color ratio.

Specifications

Specification Status Comment
CSS Fonts Module Level 4
The definition of 'font-stretch' in that specification.
Working Draft
CSS Fonts Module Level 3
The definition of 'font-stretch' in that specification.
Candidate Recommendation

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
font-stretchChrome Full support 62Edge Full support 17Firefox Full support 62IE No support NoOpera Full support 49Safari Full support 10.1WebView Android Full support 62Chrome Android Full support 62Firefox Android Full support 62Opera Android Full support 41Safari iOS Full support 10.3Samsung Internet Android Full support 6.0

Legend

Full support  
Full support
No support  
No support

See Also