font-synthesis-weight CSS property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since March 2023.
The font-synthesis-weight CSS property lets you specify whether or not the browser may synthesize the bold typeface when it is missing in a font family.
It is often convenient to use the shorthand property font-synthesis to control all typeface synthesis values.
Syntax
css
/* Keyword values */
font-synthesis-weight: auto;
font-synthesis-weight: none;
/* Global values */
font-synthesis-weight: inherit;
font-synthesis-weight: initial;
font-synthesis-weight: revert;
font-synthesis-weight: revert-layer;
font-synthesis-weight: unset;
Values
Formal definition
| Initial value | auto |
|---|---|
| Applies to | all elements and text. It also applies to ::first-letter and ::first-line. |
| Inherited | yes |
| Computed value | as specified |
| Animation type | discrete |
Formal syntax
font-synthesis-weight =
auto |
none
Examples
Disabling synthesis of bold typeface
This example shows turning off synthesis of the bold typeface by the browser in the Montserrat font.
HTML
html
<p class="english">
This is the default <strong>bold typeface</strong> and
<em>oblique typeface</em>.
</p>
<p class="english no-syn">
The <strong>bold typeface</strong> is turned off here but not the
<em>oblique typeface</em>.
</p>
CSS
css
@import "https://fonts.googleapis.com/css2?family=Montserrat&display=swap";
.english {
font-family: "Montserrat", sans-serif;
}
.no-syn {
font-synthesis-weight: none;
}
Result
Specifications
| Specification |
|---|
| CSS Fonts Module Level 4 # font-synthesis-weight |
Browser compatibility
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font-synthesis-weight
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auto
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none
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Legend
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- Full support
- Full support