Apple Releases Safari Technology Preview 143 With Bug Fixes and Performance Improvements

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 release 143 includes bug fixes and performance improvements for Web Inspector, CSS Container Queries, CSS Cascade Layers, Subgrid, CSS, JavaScript, Rendering, Web Animations, SVG, Scrolling, WebAuthn, WebGL, HTML, Web API, Media, Accessibility, File System Access, and Web Extensions.

The current ‌Safari Technology Preview‌ release is built on the Safari 15.4 update and it includes Safari 15 features introduced in macOS Monterey.

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

Generic iOS 19 Feature Mock Light

iOS 19 Rumored to Be Compatible With These iPhones

Sunday December 22, 2024 8:09 am PST by
iOS 19 will not drop support for any iPhone models, according to French website iPhoneSoft.fr. The report cites a source within Apple. The report said that iOS 19 will be compatible with any iPhone that is capable of running iOS 18, which would mean the following models: iPhone 16 iPhone 16 Plus iPhone 16 Pro iPhone 16 Pro Max iPhone 15 iPhone 15 Plus iPhone 15 Pro ...
apple wallet drivers license feature iPhone 15 pro

Apple Says iPhone Driver's Licenses Coming to These U.S. States Next

Tuesday December 24, 2024 10:49 am PST by
In select U.S. states, residents can add their driver's license or state ID to the Wallet app on the iPhone and Apple Watch, providing a convenient and contactless way to display proof of identity or age at select airports and businesses, and in select apps. Below, we outline which U.S. states and territories offer the feature, and additional states that have committed to rolling it out in...
AirTag and Lavender iPhone

AirTag 2 Launching Next Year With These New Features

Tuesday December 24, 2024 8:35 am PST by
Apple is expected to release an AirTag 2 next year, and a few new features and changes have already been rumored for the item tracker. Below, we recap what to expect from the AirTag 2: The new AirTag is expected to be equipped with Apple's second-generation Ultra Wideband chip for longer range. The chip debuted last year in the iPhone 15 and the Apple Watch Ultra 2, and Apple said it...
m3 macbook air blue

Apple Accidentally Leaked the Next MacBook Air

Sunday December 22, 2024 8:33 am PST by
Apple earlier this month released macOS 15.2, and in doing so it accidentally confirmed new MacBook Air models coming next year. Apple accidentally released macOS 15.2 restore files for unreleased "‌MacBook Air‌ (13-inch, M4, 2025)" and "‌MacBook Air‌ (15-inch, M4, 2025)" models. While it no surprise that the 13-inch and 15-inch MacBook Air models were going to be updated with the M4 ...
New Things Your iPhone Can Do in iOS 18

22 New Things Your iPhone Can Do in iOS 18.2

Monday December 23, 2024 6:30 am PST by
Apple released iOS 18.2 in the second week of December, bringing the second round of Apple Intelligence features to iPhone 15 Pro and iPhone 16 models. This update brings several major advancements to Apple's AI integration, including completely new image generation tools and a range of Visual Intelligence-based enhancements. Apple has added a handful of new non-AI related feature controls as...
iPhone 16 Apple Store

iPhone Sizes Change Next Year: What to Know

Monday December 23, 2024 7:40 am PST by
This year, Apple tweaked iPhone 16 Pro screen sizes to make them bigger than 2023's iPhone 15 Pro models, and next year we are also expecting a change in the size of the displays in the iPhone 17 lineup. Here's what we know. Standard iPhone 17 Apple could introduce a new display size for the standard iPhone 17 model in 2025. The iPhone 17 could measure in at 6.3 inches, up from 6.1 inches,...
apple silicon mac lineup 2024 feature purple m5

Macs With M5 Chips Expected to Launch in This Order

Monday December 23, 2024 8:27 am PST by
Apple supply chain analyst Ming-Chi Kuo today outlined mass production timing for the M5 series of chips, which he expects to be used in both future Macs and Apple Intelligence servers. The rollout will likely begin next year. Kuo expects the standard M5 chip to enter mass production in the first half of 2025, followed by the M5 Pro and M5 Max chips in the second half of the year. Then, he...
iphone 16 pro design cameras

iPhone 18 Pro Rumored to Be More Like DSLR Camera With This Upgrade

Monday December 23, 2024 6:24 am PST by
While the iPhone 18 Pro and iPhone 18 Pro Max are still nearly two years away from launching, a new feature has already been rumored for the devices. In a blog post today, Apple supply chain analyst Ming-Chi Kuo reiterated that the main rear camera on both iPhone 18 Pro models will offer variable aperture, which would be a first for the iPhone. The main camera refers to the 48-megapixel...
iPhone 17 Slim Feature Single Camera 2 Redux

Top 5 Apple Products to Look Forward to in 2025

Friday December 20, 2024 2:22 pm PST by
It's looking like 2025 is going to be an important year for Apple, with the company planning to revamp the iPhone, push further into smart home products, and improve Apple Intelligence. There are tons of new products rumored for 2025, including new iPhones, M4 Macs, a smart home command center, and much more. We've highlighted the top five Apple products that will have the biggest impact in...

Top Rated Comments

adamw Avatar
36 months ago
Safari bug fixes and improvements are always welcome.
Score: 2 Votes (Like | Disagree)
nortonandreev Avatar
36 months ago

It's also gives you insight to what Safari might offer in future MacOS updates. MacOS 12.3 betas offered Safari version 15.4, and the first MacOS 12.4 beta offers Safari version 15.5. I would guess the current Safari tech preview build is 15.6 now?
It’s still on 15.4. But WebKit is newer version than the one which the latest 15.5 build is based on.
Score: 1 Votes (Like | Disagree)
TracesOfArsenic Avatar
36 months ago
I look forward to the day I can use Safari for full screen streaming while using subtitles. For years the display will flicker when UI (ie subtitles) change lines. It's subtle but it's there and it drives me mental.
Score: 1 Votes (Like | Disagree)
Sheepish-Lord Avatar
36 months ago

I look forward to the day I can use Safari for full screen streaming while using subtitles. For years the display will flicker when UI (ie subtitles) change lines. It's subtle but it's there and it drives me mental.
I look forward to the day I can watch a stream and it doesn’t eat up 2GB of memory and eventually give me a memory warning error about an 1hr with nothing else open.
Score: 1 Votes (Like | Disagree)