---
title: Safari Technology Preview 38 Release Notes
framework: safari-technology-preview-release-notes
role: article
role_heading: Article
path: safari-technology-preview-release-notes/stp-release-38
---
# Safari Technology Preview 38 Release Notes
Preview the latest web technology updates including: Beacon API, Fetch API, Web Payments, CSS, Web API, Media, Apple Pay, Web Inspector, and WebDriver.
## Overview
Overview Safari Technology Preview Release 38 is now available for download for macOS Sierra and betas of 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 220128-220795. Beacon API Enabled the Beacon API by default as an experimental feature (r220553) Added support for CORS-preflighting (r220442) Added support for CORS-preflighting on redirects (r220497) Added support for connect-src CSP checks on redirects (r220549) Updated sendBeacon() to rely on FetchBody instead of the whole FetchRequest (r220366) Changed to use “application/octet-stream” content-type for payloads of ArrayBuffer and ArrayBufferView types (r220779) Fetch API Added support for Request keepalive getter (r220244) Changed Response to keep all ResourceResponse information (r220320) Implemented quota limitation for keepalive Fetch requests (r220751) Web Payments Enabled Payment Requests as an experimental feature (r220787) CSS Added support for parsing of the font-display property (r220725) Implement caret-color support (r220706, r220714) Added a fast path for rotate() and rotateZ() transform parsing (r220382) Fixed parsing of to allow time starting with a ‘.’ without a leading 0 (r220252) Fixed a hit testing issue occurring when an SVG rect element with a non-default stroke style applied (r220717) Web API Added support for considering file extensions in the accept attribute of HTML file input elements (r220135) Improved support for referrer policies (r220208) Fixed the Promise resolve and reject function to have a length of 1 (r220324) Fixed an early error on an ANY operator before new.target (r220481) Fixed removing an empty
element when inside a table cell (r220398) Fixed XHR to only fire an abort event if the cancellation was requested by the client (r220731) Media Fixed deleting the old subtitle track on src attribute change event (r220472) Apple Pay Added support for phonetic contact names (r220718) Web Inspector Added Canvas path preview when viewing a recording (r220370) Changed clicking on an autocomplete suggestion to apply it, not dismiss it (r220614) Removed text-shadow and gradient backgrounds (r220710) Updated the filter icon in the styles sidebar (r220609) WebDriver Added support for interacting with