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 39a is a followup to Safari Technology Preview 39, which was released earlier this week but suffered from a crashing issue on launch on macOS High Sierra. The new update includes the same features with fixes and improvements for Beacon API, Directory Upload, Fetch API, Input Events, JavaScript, WebAssembly, WebRTC, Web Inspector, and Media.

With Safari 11 now available to developers 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.

Top Rated Comments

redheeler Avatar
47 months ago
This is how they routinely deactivate software for their "obsolete" Macs to get you to go out and buy a new one.
As someone who owns a lot of older Macs from 2010 and 2011, now six or seven years old, I am actually surprised at how well they run Apple's latest software. It's true I upgraded them with SSDs, and newer versions of MacOS kind of need that to perform well - but it's certainly not the same as going out and buying a new Mac.

10 years ago, the newest Mac OS X running flawlessly on a 7-year-old Mac (or even older, as technically unsupported Macs from 2008/2009 can run MacOS Sierra today) was almost unheard of. The dual-processor G4 towers could just barely do ok on Leopard, and without official support from Apple (733 MHz+ was required).
Score: 6 Votes (Like | Disagree)
redheeler Avatar
47 months ago
The bigger question for me is what kind of quality control does "TimMAAY" have that no one even bothered to launch the build before releasing it to the public? I realize this is a beta release, but this is ridiculously embarrassing even for that. This is something that most Alpha releases don't even do!
Obviously the crash wasn't happening for everyone. I installed Release 39 on my 5K iMac, haven't updated to 39a, and no issues whatsoever.

I'm sure it was tested before release, and it didn't crash for them either - but it's simply not possible to take into account all possible issues and testing environments. I also wonder if somehow the app got corrupted during distribution, and some users downloaded the corrupted version while others did not. Only Apple knows for sure what happened.

But this is kind of the point of beta software, to find and fix issues that might be missed during Apple's own testing. Crash reports are sent and that helps Apple locate and fix an issue that otherwise may not be easy to discover or reproduce.
Score: 5 Votes (Like | Disagree)
kevinthebright Avatar
47 months ago
You're assuming that Apple wasn't testing to see how they could deliberately MAKE it crash on certain machines. Apple does this. This is how they routinely deactivate software for their "obsolete" Macs to get you to go out and buy a new one. I see this a lot on an older Mac Pro. Apple desperately wants the Silver Tower people to give up those machines but they won't because Apple doesn't have a product that does what they will do STILL after ALL these YEARS! :(
Do you have evidence or is this just a conspiracy theory?
Score: 3 Votes (Like | Disagree)
MacSince1985 Avatar
47 months ago
You're assuming that Apple wasn't testing to see how they could deliberately MAKE it crash on certain machines. Apple does this. This is how they routinely deactivate software for their "obsolete" Macs to get you to go out and buy a new one. I see this a lot on an older Mac Pro. Apple desperately wants the Silver Tower people to give up those machines but they won't because Apple doesn't have a product that does what they will do STILL after ALL these YEARS! :(
Can you give us some evidence or examples? I have one of those silver towers (2010, upgraded to 12-core 3.46GHz) and it runs everything I throw at it smoothly.
Score: 3 Votes (Like | Disagree)
JaguarF Avatar
47 months ago
479 points on html5test. Safari is catching up.
Score: 2 Votes (Like | Disagree)
mdriftmeyer Avatar
47 months ago
You're assuming that Apple wasn't testing to see how they could deliberately MAKE it crash on certain machines. Apple does this. This is how they routinely deactivate software for their "obsolete" Macs to get you to go out and buy a new one. I see this a lot on an older Mac Pro. Apple desperately wants the Silver Tower people to give up those machines but they won't because Apple doesn't have a product that does what they will do STILL after ALL these YEARS! :(
You have never worked for an OS company. Being NeXT/Apple alum nothing we did was overseen by Steven P. Jobs. To insinuate Timmmay isn't doing his job makes you look like an imbecile. I fully expect the child police of Macrumors to warn me for calling you out, but you are an imbecile.
Score: 2 Votes (Like | Disagree)

Top Stories

april 2021 event coverage feature

Apple Event Live Coverage: New iPads, AirTags, and More Expected [Event Over]

Tuesday April 20, 2021 9:07 am PDT by
Apple's virtual "Spring Loaded" event kicks off today at 10:00 a.m. Pacific Time, with Apple expected to debut updated iPad models and perhaps some other hardware such as AirTags or iMac models based on Apple silicon. Apple is providing a live video stream on its website, on YouTube, and in the company's TV app across its platforms. We will also be updating this article with live blog...
m1 imac colors

Apple Announces Redesigned iMac With M1 Chip and Seven Color Options

Tuesday April 20, 2021 10:22 am PDT by
Apple has announced a new, redesigned 24-inch iMac, featuring an M1 chip, a 4.5K display, and a range of color options, as well as an improved cooling system, front-facing camera, speaker system, microphones, power connector, and peripherals. The new iMac features a completely new compact design, and comes in a range of seven striking colors, including green, yellow, orange, pink, purple,...
duan rui iphone 12 13 notch

New Images Show Smaller iPhone 13 Notch Compared to iPhone 12

Saturday April 17, 2021 11:38 pm PDT by
Leaker known as "DuanRui" has shared more images that could give us our best look yet at Apple's redesigned notch for the iPhone 13. The new pictures follow similar images shared by the leaker last week, but the latest shots include a comparison with the existing iPhone 12 notch. DuanRui posted three images on Twitter that apparently originate from Weibo, although source details remain...
Top Stories 57 Feature

Top Stories: Apple Event Next Tuesday, Mini-LED iPad Pro, iPhone Rumors

Saturday April 17, 2021 6:00 am PDT by
It feels like we've been waiting forever for new Apple products, but the wait is almost over as Apple has announced a media event for next Tuesday, so make sure to tune into MacRumors for full coverage of everything Apple announces. While that was the big news this week, we also got some new details on Apple's iPhone plans for 2022 and 2023 courtesy of analyst Ming-Chi Kuo, and we also saw...
iphone 12 preorder purple

Apple Launching iPhone 12 and 12 Mini in New Purple Color on April 30

Tuesday April 20, 2021 10:08 am PDT by
Apple today announced that the iPhone 12 and iPhone 12 mini will be available in a new purple color starting April 30, with pre-orders starting this Friday. Apple is also releasing a new MagSafe Leather Case and Leather Sleeve in Deep Violet, a Silicone Case in Capri Blue, Pistachio, Cantaloupe, or Amethyst, and a Leather Wallet in Arizona, all available to order beginning today. iPhone...
f1618938547

Apple Announces AirTag Tracking Devices Starting At $29 Each

Tuesday April 20, 2021 10:10 am PDT by
Apple today announced AirTag, a Tile-like Bluetooth tracking device that's designed to be attached to items like keys and wallets for tracking purposes, letting you find them right in the Find My app. AirTags are accessories for attaching to backpacks, luggage, and other items. Any U1 device like the iPhone 12 can be used for precision finding to guide you right to the item you're looking...
iPad Pro

New 12.9-Inch iPad Pro Will Be 0.5mm Thicker to Accommodate Mini-LED Display

Monday April 19, 2021 11:30 am PDT by
The upcoming 12.9-inch iPad Pro will be thicker than the previous-generation version, likely due to the inclusion of the mini-LED display. We've heard several rumors about the change in thickness, and now leaked design images have confirmed it. A source that designs accessories for Apple devices sent MacRumors a series of photos that feature exact dimensions for the new iPad Pro models, and...
ipad pro with m1 chip

Apple Introduces Next-Generation iPad Pro With M1 Chip, Thunderbolt, 5G, XDR Display, and More

Tuesday April 20, 2021 10:40 am PDT by
Apple today announced the next-generation iPad Pro with the same M1 chip found in the latest Macs, Thunderbolt and USB4 support, 5G connectivity on cellular models with mmWave support in the United States, and more. With an 8-core CPU and 8-core GPU, Apple says the M1 chip in the new iPad Pro provides up to 50% faster performance and up to 40% faster graphics compared to the A12Z Bionic chip ...
iPad Pro Feature Orange

Wedbush Analysts Say 'Spring Loaded' Event Will Debut New iPads With 'Modest Price Increase,' Along With 'a Few Surprises'

Monday April 19, 2021 6:37 am PDT by
Apple is planning to launch a new entry-level iPad, iPad mini, and iPad Pro at its "Spring Loaded" event tomorrow, along with "a few surprises," according to Wedbush analysts. In a new note to investors, seen by MacRumors, Wedbush analysts Daniel Ives and Strecker Backe explained that the iPad will be the main focus of Apple's "Spring Loaded" event, with new entry-level iPad, iPad mini, and ...
flat imac 3d 3 teal

Reliable Leaker Hints Redesigned Colorful iMac to Debut at 'Spring Loaded' Event

Saturday April 17, 2021 4:43 am PDT by
Reliable leaker known as l0vetodream has hinted that Apple may debut its rumored redesigned and colorful iMac at its "Spring Loaded" event on Tuesday, April 20. In a tweet, the leaker posted an image of Apple's logo used for marketing the upcoming event and an image of the retro rainbow Apple logo alongside the colorful lineup of G3 iMacs. Apple leaker Jon Prosser previously reported that...