Apple Releases Safari Technology Preview 173 With Safari 17 Features - MacRumorsOpen MenuShow RoundupsShow Forums menuVisit ForumsOpen Sidebar
Skip to Content

Apple Releases Safari Technology Preview 173 With Safari 17 Features

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

Safari Technology Preview Feature
‌Safari Technology Preview‌ 173 adds functionality that is included in Safari 17, coming with macOS Sonoma. There are Feature Flags that replace the Experimental Features section of the Develop menu, and the Develop menu itself has been revamped. Responsive Design Mode has been updated to focus on the responsiveness of a page's design at any height or width.

Available features on macOS Sonoma include Profiles for separating browsing data like History and Favorites, web apps, and improved private browsing mode. Features for all operating systems include Live Text support for vertical text recognition in images and videos, HEIC support, and JPEG XL, a new image format with an improved compression algorithm for better image quality at smaller file sizes than JPEG.

The browser also includes updates for Web Inspector, CSS, Media Queries, Rendering, Editing, JavaScript, Popover, Images, Media, Web API, and SVG.

The current ‌Safari Technology Preview‌ release is compatible with machines running macOS Monterey 12.3 or later, macOS Ventura, and macOS Sonoma, the latest version of macOS that Apple is beta testing right now.

The ‌Safari Technology Preview‌ update is available through the Software Update mechanism in System Preferences or System Settings 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.

Popular Stories

iPhone Duo Display Cracking

Apple Alerts Stores to iPhone Duo's Display Cracking Issue

Friday October 30, 2026 3:20 pm PDT by
In a memo shared with Apple Stores and Apple Authorized Service Providers this week, and later obtained by MacRumors, Apple provided technicians with guidance on how to diagnose and address the iPhone Duo's inner display cracking issue. If a customer reports the issue, Apple advised technicians to inspect the iPhone Duo and repair or replace it in accordance with their standard procedures....
iPad mini OLED feature 1

Apple Executive Comments on New iPad Mini Lacking 120Hz Display

Thursday October 29, 2026 1:47 pm PDT by
While the new iPad mini has an OLED display, the device does not support ProMotion, meaning the display's refresh rate is limited to 60Hz instead of 120Hz. ProMotion support would have allowed for the iPad mini's refresh rate to automatically adjust from 10Hz to 120Hz depending on the content being displayed, but evidently Apple has kept the feature exclusive to the iPad Pro among iPad...
Pinched iPad Mini

Apple Avoids Showing Pinched Fingers on iPad Mini Page in South Korea

Thursday October 29, 2026 11:52 am PDT by
In the U.S. and most other countries, Apple's website shows the new iPad mini being held by pinched fingers, but this is not the case in South Korea. The new iPad mini shown with pinched fingers on Apple's website in the U.S. On its South Korean website, Apple simply shows an image of the iPad mini on its own. The new iPad mini shown without pinched fingers on Apple's website in South Korea ...

Top Rated Comments

44 months ago

Support for JPEG XL does seem odd. Seems like that ship has passed. Also Google seems to be starting to promote AVIF which is a better compression algorithm and can do video as well.
Many in the web community were pretty upset that Google dropped support for JPEG XL after including it behind a flag for months. JPEG XL has advantages over AVIF, including progressive decoding and the ability to recompress existing JPEG files in a lossless fashion while saving 20% on file size.

I think it's a shrewd move by Apple, getting out ahead of Google with an image format many in the web community really want. However JPEG XL was being viewed previously, it'll be supported on hundreds of millions devices this fall after Sonoma, iOS 17 and iPadOS ship.

The article The Case for JPEG XL ('https://cloudinary.com/blog/the-case-for-jpeg-xl') covers all of the details.
Score: 3 Votes (Like | Disagree)
PsykX Avatar
44 months ago

boo, no profiles except on Sonoma :(
I've gotta say, this is the only reason I want the new Safari. Want to separate Home from Work. Guess I'll wait more!
Score: 2 Votes (Like | Disagree)
44 months ago

I downloaded the tech preview but I can't view JPEG XL files - it's not listed in the Developer > Feature Flags section. How do I enable support for it? I'm on macOS Ventura 13.4.1 - is it a Sonoma-only feature?
JPEG XL is Sonoma-only at this point.
Score: 1 Votes (Like | Disagree)
44 months ago

Safari Technology Preview 173 adds functionality that is included in Safari 17
[LIST=1]
* I know, I am in minority for asking this feature - Split Tabs. I found it super useful than cascading two windows and switching between them, window losing focus etc. Arc Browser is super helpful with this feature.
* Native ad blocking would be great just like how Brave does. Using external ad blockers is hogging my machine/Safari and I end up restarting Safari.
Score: 1 Votes (Like | Disagree)
Mr.Mozi Avatar
44 months ago
Can someone confirm whether the responsive presets (^⌘R) are back or not? Apple has removed them entirely in Sonoma's Safari 17, making web development quite hard.



Attachment Image
Score: 1 Votes (Like | Disagree)
CostaMoses Avatar
44 months ago

boo, no profiles except on Sonoma :(

I've gotta say, this is the only reason I want the new Safari. Want to separate Home from Work. Guess I'll wait more!
you both may want to try Arc Browser - their profiles and spaces work really well. I used Safari for pretty much everything, but switched over a few months ago and am so happy with it! The only thing I miss is how the codes texted to me would autofill on Safari. That is such a nice Safari feature.
Score: 1 Votes (Like | Disagree)
Latest Stories
Apple Watch Ultra 4 Hits All-Time Low Price With Amazon's $99 Discount
Apple Watch Ultra 4 Hits All-Time Low Price With Amazon's $99 Discount
12 hours ago
Reminder: Apple's Big Discount on Beats 360 Ear Cushions Ends Today
Reminder: Apple's Big Discount on Beats 360 Ear Cushions Ends Today
12 hours ago
Here's a New Tour of Apple's HomeView Software
Here's a New Tour of Apple's HomeView Software
12 hours ago
Apple Reveals New iPad Mini's Battery Capacity
Apple Reveals New iPad Mini's Battery Capacity
13 hours ago
Top Stories: Apple's Big MacBook Pro, iPad mini and iMac Updates
Top Stories: Apple's Big MacBook Pro, iPad mini and iMac Updates
15 hours ago
'Pluribus' Season 2 Reportedly Starts Production Today
'Pluribus' Season 2 Reportedly Starts Production Today
21 hours ago
iPhone 18 Pro Sales Surge in China, Offsetting Decline in U.S. and Japan
iPhone 18 Pro Sales Surge in China, Offsetting Decline in U.S. and Japan
22 hours ago
HomeView Software 27.2: Wallpapers, Control Center, and More
HomeView Software 27.2: Wallpapers, Control Center, and More
1 day ago
Apple Alerts Stores to iPhone Duo's Display Cracking Issue
Apple Alerts Stores to iPhone Duo's Display Cracking Issue
1 day ago
iOS 27.3 Will Enable These Apple Intelligence Features in China
iOS 27.3 Will Enable These Apple Intelligence Features in China
1 day ago
Apple Says iOS 27.3 Beta Coming Next Week
Apple Says iOS 27.3 Beta Coming Next Week
1 day ago
Apple's Flash Storage Suppliers Are Finally 'Getting Their Revenge'
Apple's Flash Storage Suppliers Are Finally 'Getting Their Revenge'
1 day ago
14 New Things Your iPhone Can Do in iOS 27.2
14 New Things Your iPhone Can Do in iOS 27.2
1 day ago
iPhone Duo Review: One Week Later
iPhone Duo Review: One Week Later
1 day ago
Samsung Mocks iPhone Duo Display Cracks in New Ad Campaign
Samsung Mocks iPhone Duo Display Cracks in New Ad Campaign
1 day ago
The MacRumors Show: OLED MacBook Pro, iPad Mini 8, and More
The MacRumors Show: OLED MacBook Pro, iPad Mini 8, and More
1 day ago
MacBook Pro With Touch Display: 15 More Details Revealed
MacBook Pro With Touch Display: 15 More Details Revealed
1 day ago
Russia Places Apple on State Surveillance Registry
Russia Places Apple on State Surveillance Registry
2 days ago
Halloween Weekend Brings Discounts on Apple Accessories and Pre-Orders
Halloween Weekend Brings Discounts on Apple Accessories and Pre-Orders
2 days ago
Apple Has Released More Than 25 New Products in the Past Two Months
Apple Has Released More Than 25 New Products in the Past Two Months
2 days ago
Local Code Launches as Free, Private AI Assistant Tool for Mac
Local Code Launches as Free, Private AI Assistant Tool for Mac
2 days ago
Apple Acquires Ascend.io
Apple Acquires Ascend.io
2 days ago
HomePod Mini 2 Launches Today: All the New Features
HomePod Mini 2 Launches Today: All the New Features
2 days ago
AirTag 2 4-Pack Drops to New Low Price of $69.99
AirTag 2 4-Pack Drops to New Low Price of $69.99
2 days ago
Rian Johnson's iPhone Camera App Goes Viral
Rian Johnson's iPhone Camera App Goes Viral
2 days ago
Where Did All the iPhone Duos Go? Mostly to Apple's Stores
Where Did All the iPhone Duos Go? Mostly to Apple's Stores
2 days ago
Apple's Touchscreen MacBook Pro Could Ship 1.5M Units in 2027
Apple's Touchscreen MacBook Pro Could Ship 1.5M Units in 2027
2 days ago
New Apple TV 4K and iPad Mini: RAM Amounts Revealed
New Apple TV 4K and iPad Mini: RAM Amounts Revealed
2 days ago
Apple Executive Comments on New iPad Mini Lacking 120Hz Display
Apple Executive Comments on New iPad Mini Lacking 120Hz Display
2 days ago
Here's a Hands-On Look at HomePod Mini 2's New Two-Tone Colors
Here's a Hands-On Look at HomePod Mini 2's New Two-Tone Colors
2 days ago

🔗 Related Apple News & Rumors

Stay updated with the latest Apple ecosystem news and verified rumors