Apple has released a new update of Safari Technology Preview for macOS Mojave and the macOS Catalina beta
This release covers WebKit revisions 248024-248705.Safari Technology Preview 90 released
Web API
Fixed ping loads to not prevent page caching (r248265)
Prevented autofocus for cross-origin iframes (r248491)
Prevented navigations of frames about to get replaced by the result of evaluating javascript: URLs (r248410)
Updated Element.outerHTML to link missing attribute prefixes in some cases in HTML documents (r248042)
Updated the wrapper for navigator.geolocation to not become GC-collectable once its frame is detached (r248276)
Media
Fixed an issue where muted elements could block the display from sleeping (r248387)
WebRTC
Fixed incorrect this in negotiationneeded event (r248267)