Font metric overridesLimited availability
The ascent-override, descent-override, and line-gap-override descriptors adjust the display of a font declared in an @font-face statement. This can help make fallback fonts look the same size.
Not yet supported in all major browsers — check the table and provide a fallback.
Browser support
DesktopChrome
1–86Not supported
87+Supportedsince Nov 17, 2020
Current: 155Edge
12–86Not supported
87+Supportedsince Nov 19, 2020
Current: 154Firefox
1–88Not supported
89+Supportedsince Jun 1, 2021
Current: 157Safari
✕Not supportedup to 27
Current: 27MobileChrome Android
18–86Not supported
87+Supportedsince Nov 17, 2020
Current: 155Firefox Android
4–88Not supported
89+Supportedsince Jun 1, 2021
Current: 157Safari iOS
✕Not supportedup to 27
Current: 27How to use
Not supported in Safari, Safari iOS. Use feature detection below and provide a fallback (or a polyfill) for those browsers.
Example
Full syntax and examples are on MDN: ascentOverride.
Feature detection
JS · check before using
if ("FontFace" in globalThis && "ascentOverride" in FontFace.prototype) {
// FontFace.ascentOverride is available
}Sub-features
Support for each part of the feature (6). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| FontFace.ascentOverride | 87 | 87 | 89 | ✕ | 87 | 89 | ✕ |
| FontFace.descentOverride | 87 | 87 | 89 | ✕ | 87 | 89 | ✕ |
| FontFace.lineGapOverride | 87 | 87 | 89 | ✕ | 87 | 89 | ✕ |
| @font-face.ascent-override | 87 | 87 | 89 | ✕ | 87 | 89 | ✕ |
| @font-face.descent-override | 87 | 87 | 89 | ✕ | 87 | 89 | ✕ |
| @font-face.line-gap-override | 87 | 87 | 89 | ✕ | 87 | 89 | ✕ |