index.md

---

title: size-adjust
slug: Web/CSS/@font-face/size-adjust
page-type: css-at-rule-descriptor
browser-compat: css.at-rules.font-face.size-adjust

---

{{CSSRef}}

The size-adjust CSS descriptor 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.

The size-adjust descriptor behaves in a similar fashion to the {{cssxref("font-size-adjust")}} property. It calculates an adjustment per font by matching ex heights.

Syntax

size-adjust: 90%;

Values

• <percentage>

  • : A {{cssxref("<percentage>")}} value with an initial value of 100%.

All metrics associated with this font are scaled by the given percentage. This includes glyph advances, baseline tables, and overrides provided by {{cssxref("@font-face")}} descriptors.

Formal definition

{{cssinfo}}

Formal syntax

{{csssyntax}}

Examples

Overriding metrics of a fallback font

The size-adjust property can help when overriding the metrics of a fallback font to better match those of a primary web font.

@font-face {
  font-family: web-font;
  src: url("https://example.com/font.woff");
}

@font-face {
  font-family: local-font;
  src: local(Local Font);
  size-adjust: 90%;
}

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{cssxref("@font-face/font-display", "font-display")}} descriptor

• {{cssxref("@font-face/font-family", "font-family")}} descriptor

• {{cssxref("@font-face/font-weight", "font-weight")}} descriptor

• {{cssxref("@font-face/font-style", "font-style")}} descriptor

• {{cssxref("@font-face/font-stretch", "font-stretch")}} descriptor

• {{cssxref("font-feature-settings", "font-feature-settings")}}

• {{cssxref("@font-face/font-variation-settings", "font-variation-settings")}} descriptor

• {{cssxref("@font-face/src", "src")}} descriptor

• {{cssxref("@font-face/unicode-range", "unicode-range")}} descriptor

• {{cssxref('font-size-adjust')}} property