Apple Releases Safari Technology Preview 40 With Bug Fixes and Feature Improvements - MacRumors
Skip to Content

Apple Releases Safari Technology Preview 40 With Bug Fixes and Feature Improvements

by

safaripreviewiconApple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced one year ago in March of 2016. Apple designed the Safari Technology Preview to test features that may be introduced into future release versions of Safari.

Safari Technology Preview release 40 includes fixes and improvements for JavaScript, FileSystem Entry API, Fetch API, Accessibility, Web API, CSS, CSS Grid, Web Inspector, Media, Rendering, and WebGL.

With Safari 11 now available through the macOS High Sierra beta, Apple is providing two versions of Safari Technology Preview, one for macOS Sierra users and one for those using macOS High Sierra.

The Safari Technology Preview update is available through the Software Update mechanism in the Mac App Store to anyone who has downloaded the browser. Full release notes for the update are available on the Safari Technology Preview website.

Apple's aim with Safari Technology Preview is to gather feedback from developers and users on its browser development process. Safari Technology Preview can run side-by-side with the existing Safari browser and while designed for developers, it does not require a developer account to download.

Tag: Safari Technology Preview

Top Rated Comments

Strelok Avatar
Strelok
117 months ago
Pls allow 4K in YouTube.
Score: 2 Votes (Like | Disagree)
D
diegov12
117 months ago
It is, safari doesn’t support VP9. Every other browser except internet explorer support it.
Or youtube can support H.265 which is supported by most hardware already…
Score: 1 Votes (Like | Disagree)
JRoDDz Avatar
JRoDDz
117 months ago
Yes, but is it snappier?
Score: 1 Votes (Like | Disagree)
G
GastonM
117 months ago
479 with all the Experimental Features enabled on macOS Sierra 10.12.6.
Score: 1 Votes (Like | Disagree)
Read All Comments

Popular Stories

Safari Technology Preview Updated Feature 1

Apple Releases Safari Technology Preview 249 With Bug Fixes and Performance Improvements

Wednesday July 29, 2026 3:03 pm PDT by
Apple today released a new update for Safari Technology Preview, the experimental browser that was first introduced in March 2016. Apple designed Safari Technology Preview to allow users to test features that are planned for future release versions of the Safari browser. Safari Technology Preview 249 includes fixes and updates for Accessibility, Animations, CSS, Editing, Forms, HTML,...
Read Full Article • 5 comments
Four iPhone 18 Pro Colors Mock Feature

iPhone 18 Pro: Pre-Orders and Release Date

Thursday August 20, 2026 8:00 am PDT by
Apple has yet to reveal when the iPhone 18 Pro and iPhone Ultra will be announced and released, but the dates usually follow a familiar pattern. As usual, the iPhone event is expected to take place in the first half of September. Labor Day falls on September 7 this year. The last time the holiday was on that day was in 2020, but the iPhone event that year was delayed until October due to...
Read Full Article • 20 comments
Foldable iPhone 2023 Feature 1

Gurman: iPhone Ultra Wows Early Testers, Except for Its Camera

Sunday August 23, 2026 11:19 am PDT by
Apple's upcoming foldable iPhone Ultra is winning over the few people who have had hands-on time with the device, though the camera setup may leave some users wanting, according to Bloomberg's Mark Gurman. Writing in his latest Power On newsletter, Gurman says people who have used the device – which is reportedly referred to internally as the iPhone Ultra – like how it fits in your...
Read Full Article • 162 comments