Safari Technology Preview 248 Released

Summary

Jul 22, 2026 by Jon Davis Safari Technology Preview Release 248 is now available for download for macOS Golden Gate and macOS Tahoe. If you already have Safari Technology Preview installed, you can update it in System Settings under General → Software Update. This release includes WebKit changes between: 315567@main…316817@main. Accessibility Resolved Issues Fixed VoiceOver on Safari unable to navigate to content revealed by disclosure widgets using hidden="until-found". (315964@main) (173228707) Fixed stale aria-labelledby when the referenced element dynamically changes its aria-label. (316316@main) (180319221) CSS New Features Added support for forwarding missing color components when interpolating between analogous color spaces. (315569@main) (180239320) Added support for the no-clamp option on the CSS progress() function. (315977@main) (180473472) Resolved Issues Fixed serialization of various CSS at-rules not escaping identifiers. (315795@main) (178750383) Fixed :last-child and related selectors incorrectly gating on parser state outside of style resolution. (316495@main) (178879939) Fixed changing the color-scheme of an <iframe> not invalidating the appearance of the embedded document. (316467@main) (179177141) Fixed CSS scroll snap re-snap to prefer the fragment-targeted (:target) snap area over other aligned snap targets. (315880@main) (180108825) Fixed the CSS preload scanner failing to preload @import rules that follow an @layer statement rule. (315576@main) (180170656) Fixed serialization of CSSViewTransitionRule. (315614@main) (180170814) Fixed MediaList.deleteMedium() to parse its argument as a media query and remove all matching queries. (315579@main) (180270019) Fixed MediaList.appendMedium() to parse its argument as a single media query and suppress duplicates. (315594@main) (180291283) Fixed grid items with stretch or fit-content preferred sizes computing incorrect minimum-content contributions when sizing tracks. (316296@main) (180748205) Fixed ins...