Widely available
This feature is well established and works across many devices and browser versions.
Chrome
Edge
Firefox
Safari
fs-xsfont-size: 0.75rem;fs-smfont-size: 0.875rem;fs-mdfont-size: 1rem;fs-lgfont-size: 1.125rem;fs-xlfont-size: 1.25rem;fs-xxlfont-size: 1.5rem;fs-3xlfont-size: 1.875rem;fs-4xlfont-size: 2.25rem;fs-5xlfont-size: 3rem;fs-6xlfont-size: 3.75rem;fs-7xlfont-size: 4.5rem;fs-8xlfont-size: 6rem;fs-9xlfont-size: 8rem;Media Queries
Prefix a class with a breakpoint to apply it from that width up.
Pseudo Classes
Prefix a class with a state to apply it only while that state matches.