lh unitBaseline · Widely available
The lh CSS length unit corresponds to the requested line height, the computed value of the line-height property. Some lines may be higher than this based on their content.
Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Nov 21, 2023. Widely available since May 21, 2026.
Browser support
DesktopChrome
1–108Not supported
109+Supportedsince Jan 10, 2023
Current: 155Edge
12–108Not supported
109+Supportedsince Jan 12, 2023
Current: 154Firefox
1–119Not supported
120+Supportedsince Nov 21, 2023
Current: 157Safari
1–16.3Not supported
16.4+Supportedsince Mar 27, 2023
Current: 27MobileChrome Android
18–108Not supported
109+Supportedsince Jan 10, 2023
Current: 155Firefox Android
4–119Not supported
120+Supportedsince Nov 21, 2023
Current: 157Safari iOS
1–16.3Not supported
16.4+Supportedsince Mar 27, 2023
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.