Does Safari 14 work in OS 10.12.6 Sierra? I am currently using Safari 12.

Hello susandf,

Thank you for reaching out in Apple Support Communities. We understand you'd like to know if Safari 14.0 is compatible with macOS Sierra. We can help provide you additional information.

Safari 14.0 is not compatible with macOS Sierra. It's available for macOS Catalina, macOS Mojave and macOS Big Sur. That information is outlined here: About the security content of Safari 14.0

Kind regards.

susandf,

You're very welcome. Have a wonderful rest of your day.

Take care.