ch unitBaseline · Widely available
The ch CSS length unit is a font-relative length based on the width of the zero (0) character.
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
1–26Not supported
27+Supportedsince May 21, 2013
Current: 155Edge
12+Supportedsince Jul 29, 2015
Current: 154Firefox
1+Supportedsince Nov 9, 2004
Current: 157Safari
1–6Not supported
7+Supportedsince Oct 22, 2013
Current: 27MobileChrome Android
18–26Not supported
27+Supportedsince May 22, 2013
Current: 155Firefox Android
4+Supportedsince Mar 29, 2011
Current: 157Safari iOS
1–6Not supported
7+Supportedsince Sep 18, 2013
Current: 27How to use
This feature is Baseline widely available — use it freely, no fallback needed.
Example
Full syntax and examples are on MDN — see the links below.
Feature detection
There’s no simple runtime check for this feature; rely on the support table and test in your target browsers.