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Add descriptor requirement to @font-face #37709

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Jan 21, 2025
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Add descriptor requirement to @font-face #37709

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6a6da8a
Add descriptor requirement to `@font-face`
ryo-manba Jan 19, 2025
127f86f
Couple of grammar tweaks
chrisdavidmills Jan 21, 2025
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16 changes: 8 additions & 8 deletions files/en-us/web/css/@font-face/index.md
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Expand Up @@ -31,23 +31,23 @@ The **`@font-face`** [CSS](/en-US/docs/Web/CSS) [at-rule](/en-US/docs/Web/CSS/At
- {{cssxref("@font-face/font-display", "font-display")}}
- : Determines how a font face is displayed based on whether and when it is downloaded and ready to use.
- {{cssxref("@font-face/font-family", "font-family")}}
- : Specifies a name that will be used as the font face value for font properties.
- : Specifies a name that will be used as the font face value for font properties. A `font-family` name is required for the `@font-face` rule to be valid.
- {{cssxref("@font-face/font-stretch", "font-stretch")}}
- : A {{cssxref("font-stretch")}} value. Accepts two values to specify a range that is supported by a font-face, for example `font-stretch: 50% 200%;`
- : A {{cssxref("font-stretch")}} value. Accepts two values to specify a range that is supported by a font face, for example `font-stretch: 50% 200%;`
- {{cssxref("@font-face/font-style", "font-style")}}
- : A {{cssxref("font-style")}} value. Accepts two values to specify a range that is supported by a font-face, for example `font-style: oblique 20deg 50deg;`
- : A {{cssxref("font-style")}} value. Accepts two values to specify a range that is supported by a font face, for example `font-style: oblique 20deg 50deg;`
- {{cssxref("@font-face/font-weight", "font-weight")}}
- : A {{cssxref("font-weight")}} value. Accepts two values to specify a range that is supported by a font-face, for example `font-weight: 100 400;`
- : A {{cssxref("font-weight")}} value. Accepts two values to specify a range that is supported by a font face, for example `font-weight: 100 400;`
- {{cssxref("@font-face/font-feature-settings", "font-feature-settings")}}
- : Allows control over advanced typographic features in OpenType fonts.
- {{cssxref("@font-face/font-variation-settings", "font-variation-settings")}}
- : Allows low-level control over OpenType or TrueType font variations, by specifying the four letter axis names of the features to vary, along with their variation values.
- : Allows low-level control over OpenType or TrueType font variations, by specifying the four-letter axis names of the features to vary, along with their variation values.
- {{cssxref("@font-face/line-gap-override", "line-gap-override")}}
- : Defines the line gap metric for the font.
- {{cssxref("@font-face/size-adjust", "size-adjust")}}
- : Defines a multiplier for glyph outlines and metrics associated with this font. This makes it easier to harmonize the designs of various fonts when rendered at the same font size.
- {{cssxref("@font-face/src", "src")}}
- : Specifies references to font resources including hints about the font format and technology. It is required for the @font-face rule to be valid.
- : Specifies references to font resources including hints about the font format and technology. A `src` is required for the `@font-face` rule to be valid.
- {{cssxref("@font-face/unicode-range", "unicode-range")}}
- : The range of Unicode code points to be used from the font.

Expand All @@ -58,9 +58,9 @@ It's common to use both `url()` and `local()` together, so that the user's insta
If the `local()` function is provided, specifying a font name to look for on the user's device, and if the {{Glossary("user agent")}} finds a match, that local font is used. Otherwise, the font resource specified using the `url()` function is downloaded and used.

Browsers attempt to load resources in their list declaration order, so usually `local()` should be written before `url()`. Both functions are optional, so a rule block containing only one or more `local()` without `url()` is possible.
If a more specific fonts with `format()` or `tech()` values are desired, these should be listed _before_ versions that don't have these values, as the less-specific variant would otherwise be tried and used first.
If more specific fonts with `format()` or `tech()` values are desired, these should be listed _before_ versions that don't have these values, as the less specific variant would otherwise be tried and used first.

By allowing authors to provide their own fonts, `@font-face` makes it possible to design content without being limited to the so-called "web-safe" fonts (that is, the fonts which are so common that they're considered to be universally available). The ability to specify the name of a locally-installed font to look for and use makes it possible to customize the font beyond the basics while making it possible to do so without relying on an internet connection.
By allowing authors to provide their own fonts, `@font-face` makes it possible to design content without being limited to the so-called "web-safe" fonts (that is, the fonts that are so common that they're considered to be universally available). The ability to specify the name of a locally-installed font to look for and use makes it possible to customize the font beyond the basics while making it possible to do so without relying on an internet connection.

> [!NOTE]
> Fallback strategies for loading fonts on older browsers are described in the [`src` descriptor page](/en-US/docs/Web/CSS/@font-face/src#specifying_fallbacks_for_older_browsers).
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