HTML5 Please

transitions

Safe to use with fallbackcss

Most of the time, transitions just add to the experience and are not necessary for a usable experience.

Verdict
Safe to use
Category
CSS features
Browser support
Can I Use
Works in
all modern browsers

Should you use transitions in 2026?

If there is any critical interaction that requires transitions to be present, we recommend you provide an alternative experience for users on browsers that do not support this feature by feature detecting its presence.

Polyfills and fallbacks

Progressive enhancement works well here: browsers without support degrade gracefully, so a dedicated polyfill is usually unnecessary.