---
title: Safari Technology Preview 103 Release Notes
framework: safari-technology-preview-release-notes
role: article
role_heading: Article
path: safari-technology-preview-release-notes/stp-release-103
---

# Safari Technology Preview 103 Release Notes

Preview the latest web technology updates including: Web Inspector, Web API, CSS, Page loading, Back-Forward Cache, JavaScript, and Bug Fixes.

## Overview

Overview Safari Technology Preview Release 103 is now available for download for macOS Catalina and macOS Mojave. If you already have Safari Technology Preview installed, you can update in the Software Update pane of System Preferences on macOS. This release covers WebKit revisions 257162-258409. Web Inspector Merged the toolbar and tab bar to save vertical space (r257759, r257765, r257810) Redesigned resource and action identifier icons (r257753, r257757, r257791, r258039) Allowed the use of dark mode theme independently from the system-wide theme (r257620, r257801, r257833) Annotated tabs so that they are properly recognized as such (r257965) Changed to not re-cycle through items in the Styles or Computed details sidebar panel when pressing tab (r257959) Fixed clicking a button navigation item to focus it, allowing for subsequent keyboard navigation (r257411) Supported expanding and collapsing details sections with the spacebar or “enter” key (r258058) Supported cycling through scope bar items by pressing tab (r258057) Web API Aligned garbage collection for XMLHttpRequest objects with the specification (r258159) Aligned Fetch ‘request Origin header’ behavior with the specification (r258194) Changed the case of an activating service worker getting terminated to go to an activated state (r257929) Changed to load async scripts with a low priority (r257566) Changed to accept a Document as an explicit root (r257976) Implemented wildcard behavior for Cross-Origin-Expose-Headers (r258330) CSS Made the style invalidation accurate for user-action pseudo classes (r258321) Changed to avoid full style resolution on Element::focus() (r257839, r257846) Page loading Changed fixed sized SVG content to be taken into account when computing visually not empty status (r257952) Changed layers going from visually empty to non-empty to immediately trigger layer unfreezing (r257840) Back-Forward Cache Added quirk to disable to back-forward cache on docs.google.com (r257714) JavaScript Updated custom element caching to be aware of different worlds (r257414) Bug Fixes Fixed leaking DocumentTimeline and CSSTransition objects on CNN.com (r257417) Fixed icloud.com notes text in titles and headings is distorted (r258282) Fixed maps.google.com not loading properly with screen flickering when zooming (r257716)

## See Also

### 2020

- [Safari Technology Preview 117 Release Notes](safari-technology-preview-release-notes/stp-release-117.md)
- [Safari Technology Preview 116 Release Notes](safari-technology-preview-release-notes/stp-release-116.md)
- [Safari Technology Preview 115 Release Notes](safari-technology-preview-release-notes/stp-release-115.md)
- [Safari Technology Preview 114 Release Notes](safari-technology-preview-release-notes/stp-release-114.md)
- [Safari Technology Preview 113 Release Notes](safari-technology-preview-release-notes/stp-release-113.md)
- [Safari Technology Preview 112 Release Notes](safari-technology-preview-release-notes/stp-release-112.md)
- [Safari Technology Preview 111 Release Notes](safari-technology-preview-release-notes/stp-release-111.md)
- [Safari Technology Preview 110 Release Notes](safari-technology-preview-release-notes/stp-release-110.md)
- [Safari Technology Preview 109 Release Notes](safari-technology-preview-release-notes/stp-release-109.md)
- [Safari Technology Preview 108 Release Notes](safari-technology-preview-release-notes/stp-release-108.md)
- [Safari Technology Preview 107 Release Notes](safari-technology-preview-release-notes/stp-release-107.md)
- [Safari Technology Preview 106 Release Notes](safari-technology-preview-release-notes/stp-release-106.md)
- [Safari Technology Preview 105 Release Notes](safari-technology-preview-release-notes/stp-release-105.md)
- [Safari Technology Preview 104 Release Notes](safari-technology-preview-release-notes/stp-release-104.md)
- [Safari Technology Preview 102 Release Notes](safari-technology-preview-release-notes/stp-release-102.md)