Apple releases Safari 15.1 beta 1. This beta is also included in macOS 12 Monterey beta 8.
No significant changes are reported, beta seem to be focused on bug fixing.
Not fully released to this beta version, Apple now made iCloud bookmarks end-to-end encrypted (as well as history and iCloud tabs).
Beta download: Catalina, Big Sur
Release notes: Safari 15.1 Beta 1: Safari and WebKit Release Notes
Reference: Safari 15.1 Beta Now Available for macOS Big Sur and macOS Catalina
Recommendations
Developer:
Try web content on new beta version.QA engineer:
Try web content for regressions.PM/DM:
Business as usual.