---
title: Safari Technology Preview 51 Release Notes
framework: safari-technology-preview-release-notes
role: article
role_heading: Article
path: safari-technology-preview-release-notes/stp-release-51
---

# Safari Technology Preview 51 Release Notes

Preview the latest web technology updates including: Accessibility, Security, Loading, Service Workers, Rendering, Styles, Web Inspector, and bugs.

## Overview

Overview Safari Technology Preview Release 51 is now available for download for macOS Sierra and macOS High Sierra. If you already have Safari Technology Preview installed, you can update from the Mac App Store’s Updates tab. This release covers WebKit revisions 228454-228856. This release of Safari Technology Preview may reset your homepage and search engine preferences to Safari’s defaults. Accessibility Added accessibleclick event (r228827) Security Disallowed cross-origin subresources from asking for credentials (r228486) Prevented blocking authentication challenges to navigated resources (r228703) Loading Fixed provisional loads that might get committed before receiving the decidePolicyForNavigationResponse response (r228852) Service Workers Fixed the ability to download resources loaded from Service Workers (r228551) Rendering Changed to handle all SVG writing modes (r228822) Styles Improved the speed of descendent selector invalidation by using a selector filter (r228729) Web Inspector Added support to show or hide the navigation sidebar panel based on the current view (r228722) Fixed hiding the completion popover when switching panels in the Styles sidebar (r228487) Bugs Added support for scrolling a non-editable web-selection and start autoscroll when near screen edges (r228549)

## See Also

### 2018

- [Safari Technology Preview 72 Release Notes](safari-technology-preview-release-notes/stp-release-72.md)
- [Safari Technology Preview 71 Release Notes](safari-technology-preview-release-notes/stp-release-71.md)
- [Safari Technology Preview 70 Release Notes](safari-technology-preview-release-notes/stp-release-70.md)
- [Safari Technology Preview 69 Release Notes](safari-technology-preview-release-notes/stp-release-69.md)
- [Safari Technology Preview 68 Release Notes](safari-technology-preview-release-notes/stp-release-68.md)
- [Safari Technology Preview 67 Release Notes](safari-technology-preview-release-notes/stp-release-67.md)
- [Safari Technology Preview 66 Release Notes](safari-technology-preview-release-notes/stp-release-66.md)
- [Safari Technology Preview 65 Release Notes](safari-technology-preview-release-notes/stp-release-65.md)
- [Safari Technology Preview 64 Release Notes](safari-technology-preview-release-notes/stp-release-64.md)
- [Safari Technology Preview 63 Release Notes](safari-technology-preview-release-notes/stp-release-63.md)
- [Safari Technology Preview 62 Release Notes](safari-technology-preview-release-notes/stp-release-62.md)
- [Safari Technology Preview 61 Release Notes](safari-technology-preview-release-notes/stp-release-61.md)
- [Safari Technology Preview 60 Release Notes](safari-technology-preview-release-notes/stp-release-60.md)
- [Safari Technology Preview 59 Release Notes](safari-technology-preview-release-notes/stp-release-59.md)
- [Safari Technology Preview 58 Release Notes](safari-technology-preview-release-notes/stp-release-58.md)