font-sizeBaseline · Widely available
The font-size CSS property sets the text height.
Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Jul 29, 2015. Widely available since Jan 29, 2018.
Browser support
DesktopChrome
1+Supportedsince Dec 11, 2008
Current: 155Edge
12+Supportedsince Jul 29, 2015
Current: 154Firefox
1+Supportedsince Nov 9, 2004
Current: 157Safari
1+Supportedsince Jun 23, 2003
Current: 27MobileChrome Android
18+Supportedsince Jun 27, 2012
Current: 155Firefox Android
4+Supportedsince Mar 29, 2011
Current: 157Safari iOS
1+Supportedsince Jun 29, 2007
Current: 27How to use
This feature is Baseline widely available — use it freely, no fallback needed.
Example
Full syntax and examples are on MDN: font-size.
Feature detection
CSS · check before using
@supports (font-size: initial) {
/* styles that rely on font-size */
}
/* or in JavaScript */
if (CSS.supports("font-size", "initial")) {
// use it
}Documentation (MDN)
Specification
Sub-features
Support for each part of the feature (13). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| font-size | 1 | 12 | 1 | 1 | 18 | 4 | 1 |
| font-size.large | 1 | 12 | 1 | 1 | 18 | 4 | 1 |
| font-size.larger | 1 | 12 | 1 | 1 | 18 | 4 | 1 |
| font-size.medium | 1 | 12 | 1 | 1 | 18 | 4 | 1 |
| font-size.rem_values | 31 | 12 | 31 | 7 | 42 | 31 | 7 |
| font-size.small | 1 | 12 | 1 | 1 | 18 | 4 | 1 |
| font-size.smaller | 1 | 12 | 1 | 1 | 18 | 4 | 1 |
| font-size.x-large | 1 | 12 | 1 | 1 | 18 | 4 | 1 |
| font-size.x-small | 1 | 12 | 1 | 1 | 18 | 4 | 1 |
| font-size.xx-large | 1 | 12 | 1 | 1 | 18 | 4 | 1 |
| font-size.xx-small | 1 | 12 | 1 | 1 | 18 | 4 | 1 |
| font-size.xxx-large | 79 | 79 | 70 | 16.4 | 79 | 79 | 16.4 |
| svg.global_attributes.font-size | 1 | 12 | 1 | 1 | 18 | 4 | 1 |