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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.jpg

Safari Technology Preview release 139 includes bug fixes and performance improvements for Web Inspector, CSS, Web Animations, Rendering, SVG, WebAuthn, Web API, JavaScript, Content Security Policy, Media, Service Workers, Web Extensions, and more.

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.


Article Link: Apple Releases Safari Technology Preview 139 With Bug Fixes and Performance Improvements
 

Populus

macrumors 68030
Aug 24, 2012
2,738
3,412
Valencia, Spain.
I noticed that Safari Preview finally has support for `scroll({ behavior: 'smooth' })`. Been waiting so long for this that I honestly thought Apple had some kind of technical/philosophical reason for not supporting it and we'd be using polyfills forever.
How does this affect scrolling behaviour?
Do you think this will be already included on the just released macOS 12.2, or we'll have to wait until 12.3?

Thank you.
 

Unggoy Murderer

macrumors 6502a
Jan 28, 2011
869
2,683
Edinburgh, UK
Over a decade of iOS Safari and it still struggles to work properly with many websites. What are they working on?
Been using Safari as my default browser for many years and I think I've only had one issue with a strict compatibility requirement (a bank website). What struggles are you experiencing?

I'm primarily a web developer so I'm genuinely curious about your experiences.
 

Sheepish-Lord

macrumors 65816
Oct 13, 2021
1,136
1,854
This version since the last does 120fps while macOS Monterey 12.2 (just released) still does 60fps.

Below: macOS Monterey 12.2 safari
View attachment 1949815
Safari Preview 139:
View attachment 1949816
You should read the *important* notes in your screenshot. Creator of blurbusters has already stated Safari has never been compatible and it literally shows that in your screenshot.
 

Robert.Walter

macrumors 68020
Jul 10, 2012
2,410
3,110
I have a fully functional top spec 2012 Mac mini that could support Monterey but I’m stuck on Catalina.

I think Apple needs to somewhat decouple Safari from the OS. Is there a reason that Safari can’t be treated like any other app? If it was, I’d have fully functional hide my email instead of a halfassed implementation.

I’m not looking for all the feature updates for my Catalina box but if I’m getting security updates I would think that safari updates could be accomplished as well.

Apple only strands devices like this to force hardware upgrades. If the cared about environment more than profit they would extend Mac support to 10y minimum.

Edit:

Just checked Update and macOS Catalina Security Update 2022-001 10.15.7 @1.5 GB and Safari 15.3 update @92.7 MB are available. Total 1.60 GB.
 
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Kylo83

macrumors 68030
Apr 2, 2020
2,877
9,185
It has an option to disable page rendering at 60hz and unlocked the full pro motion, I hope that comes with the final public version of safari .4 it’s annoying it’s not by default and you have to select the option in the devolop menu
 

JamieLannister

macrumors 6502a
Jun 10, 2016
565
1,385
You should read the *important* notes in your screenshot. Creator of blurbusters has already stated Safari has never been compatible and it literally shows that in your screenshot.
and? one shows 60fps, one shows 120fps.

However, both safari versions (standard and preview) are smooth so I don't have an issue with any of these promotion problems others are seeing. Ghosting is a big issue, however.
 
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telo123

macrumors 6502
Mar 11, 2021
285
352
This STP update fixes "Search or ent" when audio is playing with the symbol on the address bar that causes text to be cut off on compact mode.. Still present on the stable Safari.

Screen Shot 2022-01-21 at 11.13.13 PM.png
Screen Shot 2022-01-21 at 11.13.27 PM.png
 
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JamieLannister

macrumors 6502a
Jun 10, 2016
565
1,385
This STP update fixes "Search or ent" when audio is playing with the symbol on the address bar that causes text to be cut off on compact mode.. Still present on the stable Safari.

View attachment 1949841 View attachment 1949843

WFH really sucks for developers. I'm sure I enjoy waking up in my jammies and coding right away or staying up late coding and watching Netflix at the same time but seriously get your sht together!
 
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Checksix2x

macrumors member
Oct 7, 2015
35
46
Updated my MacBook Pro to Mac OS 15.2 and upon restarting, lost Tech Preview completely. Had to download it again.
 

excelsior.ink

macrumors regular
Apr 15, 2020
131
72
I have upgraded from 138 to 139 and loading any login page (Google or Microsoft) hangs. I deleted any folders containing SafariTechnologyPreview under ~/Library but it still hangs. Everything worked fine in 138. Basically I cannot login into my accounts. Using the usual Safari works
EDIT: after reinstalling SafariTechnologyPreview now even loading youtube hangs
 
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nortonandreev

macrumors 68020
Jan 11, 2016
2,080
2,649
Manchester, United Kingdom
How does this affect scrolling behaviour?
Do you think this will be already included on the just released macOS 12.2, or we'll have to wait until 12.3?

Thank you.
It is part of Safari 15.4, so should be available with Monterey 12.3.

The scroll-behaviour: smooth is for when there is a link on the page that scrolls to a specific section of the page. Currently, it would directly "jump" there, where as with the smooth behaviour it will animate the scrolling. It does not relate to the scrolls performed by the user. It's a nice addition to Safari, but it's not such a big deal either.
 
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nortonandreev

macrumors 68020
Jan 11, 2016
2,080
2,649
Manchester, United Kingdom
I have upgraded from 138 to 139 and loading any login page (Google or Microsoft) hangs. I deleted any folders containing SafariTechnologyPreview under ~/Library but it still hangs. Everything worked fine in 138. Basically I cannot login into my accounts. Using the usual Safari works
EDIT: after reinstalling SafariTechnologyPreview now even loading youtube hangs
I'm having the same issue with most websites.
 
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Checksix2x

macrumors member
Oct 7, 2015
35
46
Anyone else having the issue where normal Safari loads pages fine, but the Tech Preview stalls when loading pages?
138 was completely erased from my MBP when I updated it to MacOS 12.2. I downloaded Tech Preview 139 and have the same problem you're having.
 
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nvmls

macrumors 68000
Mar 31, 2011
1,634
4,386
Anyone else having the issue where normal Safari loads pages fine, but the Tech Preview stalls when loading pages?
Happens in stable also, maybe you were just lucky not to experience it.

Over a decade of iOS Safari and it still struggles to work properly with many websites. What are they working on?
Even Chuck Norris doesn't know the answer.
 
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