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.

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)

  Safari Technology Preview 90 released