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Safari Technology Preview 105 Offers The Usual Bug Fixes and Performance Improvements

Safari Technology Preview 105 Offers The Usual Bug Fixes and Performance Improvements

Apple on Thursday released Safari Technology Preview 104, the latest version of their developer preview web browser. The preview version of Apple’s popular browser offers developers and other interested users the ability to try out features that may or may not, debut in future public release versions of Safari.

The new Preview release includes bug fixes and performance improvements for CSS, JavaScript, Media, Web Animations, Accessibility, Rendering, Web API, and Web Inspector.

Safari Technology Preview Release Notes

Release 105


  • Added Selectors Level 4 specificity calculation for pseudo classes
  • Added support for font-relative lh and rlh unit frp, CSS Values Level 4 specification
  • Corrected the computed style for outline-offset when outline-style is none
  • Fixed bad style sharing between sibling elements with different part attributes for CSS Shadow Parts
  • Implemented the CSS Color Level 4 behavior for inheritance of currentColor
  • Prevented caching definite height against perpendicular flex items


  • Fixed Intl.DateTimeFormat patterns and fields
  • Implemented BigInt.prototype.toLocaleString`
  • Updated Intl to allow calendar and numberingSystem options
  • Implemented logical assignment operators
  • Updated canonicalizeLocaleList to gracefully throw OOM error if the input and error message is too large
  • Updated module’s default cross-origin value should be “anonymous”


  • Made a change to update ScreenTime as playback state changes
  • Filtered some capture device names
  • Added support for applying a frameRate limit when the request stream is from Camera

Web Animations

  • Added support for pseudoElement on KeyframeEffect and KeyframeEffectOptions
  • Fixed computing transition-property correctly when transition-duration is set to inherit


  • Fixed smart invert to handle the picture elements on foxnews.com


  • Fixed drawing an image srcRect and imageRect to be in the same orientation of destRect
  • Fixed a missing gradient banner on fastclick.com


  • Fixed querySelector("#\u0000") to match an element with ID U+FFFD
  • Fixed scroll snap in subframes when async overflow scroll is enabled
  • Fixed zoom changes to not affect ResizeObserverSize
  • Updated CanvasRenderingContext2D.drawImage to ignore the EXIF orientation if the image-orientation is none
  • Updated documentFragment.getElementById() not work for empty-string IDs
  • Updated baseURL for a module script to be the response URL, not the request URL

Web Inspector

  • Elements Tab
    • De-indented items in the Variables section in the Computed sidebar panel so that wrapped content doesn’t line up with --
  • Sources Tab
    • Added support for copying selected call frame(s) in the Call Stack section
    • Added a “Step” button that continues execution to the next expression in the current call frame
    • Treated comma sub-expressions as separate statements to provide more intuitive formatting, additional breakpoint opportunities, and better stepping functionality
  • Storage Tab
    • Provided a way to delete multiple localStorage or sessionStorage entries
    • Allowed cookies to be set with no value
    • Fixed an issue where cookies weren’t shown on pages that have subframes that have been denied access to cookies
  • Console Tab
    • Ensured that long strings are not truncated when passed to console functions
  • Search Tab
    • Added a setting that controls whether search field is populated with the current selection when using the global search shortcut ⇧⌘F
  • Miscellaneous
    • Increased the auto-inspect debugger timeout delay to account for slower networks/devices

The update can be downloaded from the Safari Technology Preview website, or if the browser is already installed, it can be updated via the “Update” tab in the Mac App Store. Full release notes for the update are also available on the Safari Technology Preview website.

While the preview is intended for use by developers and advanced users, in order to provide Apple with feedback on the development of the Safari browser, it can be run side-by-side with the release version of Safari. The app doesn’t require a developer account to download and install. For more information, visit the Safari Technology Preview website.