Apple Launches 'Safari Technology Preview' Browser for Web Developers

Apple today launched Safari Technology Preview, a new version of its web browser aimed specifically at developers. Safari Technology Preview is aimed at giving developers a way to access new web technologies Apple is planning to implement in iOS and OS X, offering an early look at new developer tools, layout technologies, visual effects, and more.

According to TechCrunch, Apple's goal with Safari Technology Preview is to gather feedback from developers on its browser development ahead of launch through a method that's more easily accessible than WebKit.

safaritechnologypreview

Of course, Apple has for a long time offered Nightly builds of WebKit, the open source browser engine that today runs on hundreds of millions of devices and powers Apple's Safari. However, getting access to these builds takes a bit more effort than using the new Safari Technology Preview browser. Instead, with the new browser, its updates are distributed every two weeks by way of the Mac App Store's software update mechanism. That means it's less hassle to run a browser that features the latest advances in web technologies, including HTML, JavaScript, CSS and WebKit.

Safari Technology Preview can be run side-by-side with the existing Safari browser, and it's able to be set as the default browser on a machine. It includes local data stores for history, bookmarks, cookies, and cache, and it supports syncing of browsing history and bookmarks over iCloud. Visually, the Safari Technology Preview icon is designed to resemble the Safari icon, but it is purple in color instead of blue.

safaripreviewicon
The current build of Safari Technology Preview includes several JavaScript improvements, HTML enhancements, and Web Inspector changes:

JavaScript Improvements
- ECMAScript 6 support including lexical scoping, iterators, generators, arrow functions, default parameter values and many new built-in APIs
- Better standards compliant IndexedDB support with more stability
- Included the B3 JavaScript JIT compiler with low-latency, high-throughput that boosts performance
- Added the ability to use document.execCommand('copy') and document.execCommand('cut') in response to a user gesture to copy and cut text programmatically

HTML Enhancements
- The latest implementation of the Shadow DOM specification
- Added support for Content Security Policy Level 2

Web Inspector Changes
- Added memory summary and JavaScript allocations timelines
- Added a fast JavaScript sampling profiler
- Improved JavaScript profiling timeline view

Behavior Changes
- Included many web compatibility fixes and bug fixes

Safari Technology Preview can be downloaded immediately from Apple's Developer website and it will receive regular updates through the Mac App Store. While designed for developers, Safari Technology Preview does not require a developer account to download.

Top Rated Comments

Fuchal Avatar
67 months ago
The best part about this for me is that the icon is purple.
Score: 14 Votes (Like | Disagree)
macduke Avatar
67 months ago
They should make this available for iOS. How are professionals using iPad Pro supposed to test their websites? If Apple doesn't take the iPad Pro seriously then professionals aren't going to use it.
Score: 8 Votes (Like | Disagree)
djang0 Avatar
67 months ago
They should make this available for iOS. How are professionals using iPad Pro supposed to test their websites? If Apple doesn't take the iPad Pro seriously then professionals aren't going to use it.
This just goes to show how iPad Pro is not really a laptop replacement after all (just one example out of many). It's a marketing gimmick.
Score: 8 Votes (Like | Disagree)
redheeler Avatar
67 months ago
Will this allow me to actually close YouTube tabs and windows without crashing the entire GUI ('https://discussions.apple.com/thread/7282867') and forcing me to restart, unlike Safari? How long do we have to go before Safari can work with YouTube on recent machines with El Capitan again?
I have not experienced this once and it is not at all normal. Do you have any third-party extensions or plugins that may be causing this?
Score: 7 Votes (Like | Disagree)
Westside guy Avatar
67 months ago
I strongly suspect any actual useful feedback coming from actual developers is going to be drowned out by the cacophony coming from the hipsters / fanboys / other people with too much free time on their hands.
Score: 5 Votes (Like | Disagree)
AdamJD Avatar
67 months ago
Will this allow me to actually close YouTube tabs and windows without crashing the entire GUI ('https://discussions.apple.com/thread/7282867') and forcing me to restart, unlike Safari? How long do we have to go before Safari can work with YouTube on recent machines with El Capitan again?
Score: 4 Votes (Like | Disagree)

Top Stories

apple watch ecg

Apple Watch Likely to Gain Blood Pressure, Blood Glucose, and Blood Alcohol Monitoring

Monday May 3, 2021 4:03 am PDT by
The Apple Watch may gain the ability to measure blood pressure, blood glucose, and blood alcohol levels, according to newly-revealed information about one of Apple's chosen business partners. Apple has been revealed to be the largest customer of the British electronics start-up Rockley Photonics, The Telegraph reports. Rockley Photonics has developed non-invasive optical sensors for...
tile sticker e1570533758981

Tile CEO: 'We Welcome Competition From Apple, But We Think It Needs to Be Fair'

Tuesday May 4, 2021 9:51 am PDT by
Just after Apple announced its AirTags, Tile CEO CJ Prober relayed his concerns about competing with Apple in the tracking space, and said that Tile would ask Congress to investigate Apple's business practices specific to Find My and item trackers. Prober this week did an interview with Bloomberg, where he further expanded on Tile's complaints about Apple and why he feels that Tile is...
facebook instargram updated att prompt 1

Facebook and Instagram Ask Users to Enable App Tracking in Order to Keep Services 'Free of Charge'

Sunday May 2, 2021 1:22 pm PDT by
As a way to convince users to enable tracking across other apps and websites, Facebook is deploying the tactic of telling users that they must enable tracking as part of the App Tracking Transparency framework in iOS 14.5 if they want to help keep Facebook and Instagram "free of charge." App Tracking Transparency or ATT is the newest privacy feature to come to iPhone and iPad devices as part ...
fortnite apple logo 2

Epic CEO Tim Sweeney Admits App Store's 30% Cut Is Similar to Consoles, Would Have Accepted Special Deal With Apple

Tuesday May 4, 2021 1:54 pm PDT by
Apple's legal battle with Epic Games is continuing on, and during the second day of the trial, Epic Games' CEO Tim Sweeney continued his testimony against Apple. Sweeney was grilled by Apple's lawyers, and made several points seemingly favorable to Apple. In addition to mentioning how he prefers Apple's iPhone and values Apple's privacy policies that he's aiming to dismantle, Sweeney...
Flat 2021 MacBook Pro Mockup Feature 1

Mini-LED Display Production Improving for Redesigned MacBook Pro Models Later This Year

Monday May 3, 2021 8:33 am PDT by
Apple supplier TSMT, a key vendor involved in the production of mini-LED displays in the newly announced 12.9-inch iPad Pro, has been able to address technical challenges for the production of mini-LED displays to be used in the upcoming 14 and 16-inch redesigned MacBook Pro models. As reported by DigiTimes, TSMT had initially been facing production constraints with the circuit board and...
signal instagram ads3

Signal Shares the Instagram Ads Facebook Doesn't Want You to See

Wednesday May 5, 2021 1:29 am PDT by
Encrypted messaging app Signal has had a series of Instagram ads blocked from the social media platform, after it attempted to show users how much data the Facebook-owned company collects about them and how it's used to push targeted ads. In a blog post, Signal described how it generated the ads to show users why they were seeing them, simply by declaring upfront the information that the...
Foldable iPhone 2023 Feature Yellow

Kuo: Apple to Launch 8-Inch Foldable iPhone in 2023

Sunday May 2, 2021 8:43 pm PDT by
Apple is working to launch a foldable iPhone with an 8-inch QHD+ flexible OLED display in 2023, Apple analyst Ming-Chi Kuo said today in a note to investors that was seen by MacRumors. Based on our latest industry survey, we forecast that Apple will likely launch a foldable iPhone with an 8-inch QHD+ flexible OLED display in 2023, with SDC as the exclusive display supplier and Samsung Foundry...
iOS 14 on iPhone feature emergency

Apple Releases iOS and iPadOS 14.5.1 With Fixes for App Tracking Transparency Bug, WebKit Security Issues

Monday May 3, 2021 10:04 am PDT by
Apple today released iOS and iPadOS 14.5.1, minor security updates that come just a week after the release of the iOS 14.5 update. There is also a companion watchOS 7.4.1 update for Apple Watch and an iOS 12.5.3 update for older iPhone and iPad devices that don't support Apple's latest operating system versions. According to Apple's release notes, the update fixes a bug with App Tracking...
airtags teardown tile mat galaxy smarttag

iFixit Shares AirTag Teardown Revealing 'Impressively Compact' Design Compared to Tile Mate and Galaxy SmartTag

Sunday May 2, 2021 4:54 am PDT by
iFixit has shared the first of its two-part series in tearing down Apple's AirTag item tracker, revealing that Apple had to make impressive design decisions to achieve its small design, including rethinking the speaker layout. For comparison, iFixit compared Apple's AirTag to the Tile Mate and the Samsung Galaxy SmartTag. Compared to the competition, AirTag is the smallest in size, with the...
maxresdefault

Hands-On With Brydge's 12.9-Inch iPad Pro Keyboard With Trackpad

Tuesday May 4, 2021 11:48 am PDT by
Brydge has been making keyboards for Apple's iPads for years now, and the newest model, the Brydge 12.9 MAX+, is compatible with the third, fourth, and fifth-generation iPad Pro models, so it works even with the new mini-LED iPad Pro. Subscribe to the MacRumors YouTube channel for more videos. In our latest YouTube video, we checked out the new Brydge 12.9 MAX+ to see if it's a viable...