Apple Releases Safari Technology Preview 21 With Bug Fixes and Feature Improvements - MacRumors
Skip to Content

Apple Releases Safari Technology Preview 21 With Bug Fixes and Feature Improvements

by

safaripreviewiconApple today released a new update for Safari Technology Preview, the experimental browser Apple first introduced 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 21 includes bug fixes and updates for JavaScript, Fetch API, IndexedDB 2.0, CSS, Rendering, Web API, Accessibility, and Web Inspector.

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 goal with Safari Technology Preview is to receive 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.

Top Rated Comments

126 months ago
I like Safari, it's my main browser...but Safari is slowly becoming (if not already) the next IE.
Score: 4 Votes (Like | Disagree)
star-affinity Avatar
126 months ago
While it's still behind other browsers in terms of HTML5 support, Safari 10 (and TP) is the only browser that has 100% ES6/ES2015 support and Safari TP is the only browser that has 100% ES2016+ support: https://kangax.github.io/compat-table/es6/. If only they'd release new versions more often...
Pardon my ignorance, but what does that imply?
Score: 2 Votes (Like | Disagree)
126 months ago
Thanks for letting us know!

That's not good though, way behind other browsers.
While it's still behind other browsers in terms of HTML5 support, Safari 10 (and TP) is the only browser that has 100% ES6/ES2015 support and Safari TP is the only browser that has 100% ES2016+ support: https://kangax.github.io/compat-table/es6/. If only they'd release new versions more often...
Score: 2 Votes (Like | Disagree)
126 months ago
So hard for me to enjoy Safari when there is no way to stop autoplay. That is such a huge nuance on some websites and it requires hoops to trick Safari into not doing it.
Is it really that annoying? Plus you can mute tabs..
Score: 1 Votes (Like | Disagree)

Popular Stories

iphone duo

Apple Announces Foldable 'iPhone Duo'

Wednesday September 9, 2026 10:56 am PDT by
Apple today announced the "iPhone Duo," a new kind of iPhone featuring two screens and a foldable inner display. The two halves of the iPhone Duo connect into a single continuous frame with the same aspect ratio across both displays, and Apple said the transition between open and closed is designed to feel fluid. When fully open, Apple says it is the thinnest iPhone ever made, with an...
Surprise and Shine Live Coverage Article

Apple Event Live Blog: iPhone Duo, iPhone 18 Pro, and More

Wednesday September 9, 2026 9:10 am PDT by
Apple's "Surprise and Shine" event kicks off today at 10:00 a.m. Pacific Time, where we're expecting to see the foldable iPhone Duo, the iPhone 18 Pro and Pro Max, Apple Watch Series 12 and Ultra 4 models, new AirPods 5 earphones, and perhaps some other announcements. Apple is providing a live video stream on its website, on YouTube, and in the company's TV app across various platforms. We...
iOS 27 Feature Dark

Apple Announces iOS 27 Release Date

Wednesday September 9, 2026 10:46 am PDT by
At its event today unveiling the iPhone 18 Pro, AirPods 5, Apple Watch Series 12, and more, Apple announced that iOS 27 will be released later this month. iOS 27 has already been available as a developer beta since June and as a public beta since July, and Apple today said that the update will be released for all users with a compatible iPhone model on Monday, September 14. iOS 27 is...