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Safari Experimental Features: All You Need to Know
By Martin Clark 2 comments Last updated March 21, 2023
If you’ve heard the Safari Experimental Features a lot but don’t know what to do with these features, you’ve come to the right place! Read on to learn more.
Every web browser developing company, like Apple, Google, Mozilla, etc., offers advanced access to their web browsers through the Developer Tools option. This section hosts programming-level tools, utilities, and upcoming features experimentation by web browser developers. For Apple Safari web browser it’s the Experimental Features for Safari.
Also read: Safari not working? How to Troubleshoot
What Are Safari Experimental Features?
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The experimental features of Safari give you access to upcoming web tools, ideas about web element changes, new browser initiatives, behavior adjustments, and other under-test development features by the Apple development team.
As a web developer for Apple devices like iPhones, iPads, and Macs, you must know and regularly use the Experimental Features to keep your web apps and web pages bug-free. Also, using these web development tools, you can perform real-time testing of your web apps, especially when Apple releases new editions of the Safari browser.
Though the features are specifically for programmers and web developers, being a general Apple devices user, you can also activate some Safari Experimental Features. Sometimes, you’ll find activating these features beneficial to enhance the web app experience on Safari. However, if you don’t possess a clear idea of which experimental features of Safari are beneficial, you shouldn’t toy with this section of the Safari web browser application.
Also read: Safari Quick Website Search
Do you want to activate this feature on your MacBook or iMac for web development or Safari troubleshooting purposes? But you don’t know how to get the Experimental Features of Safari? No worries! Just follow the steps outlined below:
- Open Safari on your Mac.
- On the top-left corner of the screen, you must see the Apple icon , and next to it is the Safari menu . Click on it.
- A context menu will open. Click the Preferences setting from the menu.
- Alternatively, you can just click on any blank space on the Safari browser and press the Command + Comma (,) keys on your keyboard to open the Safari Preferences window.
- While on the Safari Preferences menu, the first selection you’ll see is the General tab, a cogwheel icon.
- From there, navigate to the Advanced section, a double cogwheel icon at the farthest right of the window.
- The Advanced section lets you activate various features of Safari like Smart Search Field, Accessibility, Reading List, etc.
- Look at the bottom of the same window and you should see the Show Develop menu in menu bar checkbox.
- Checkmark the checkbox to get the Develop menu on the Mac toolbar for the Safari app.
- Close the Safari Advanced Preferences window.
- Go to the Mac toolbar and click Develop .
- Hover the cursor over the Experimental Features option to visualize all the active and inactive experimental features of Safari.
- Active ones show a checkmark and inactive ones don’t.
If you need to activate any special features from this list, simply scroll the list, find the feature you want, and click it to enable the selected feature.
Also read: iOS Safari cache problem, a Fix
Did you just ask if the experimental features of Safari are also available on iOS and iPadOS? Yes, you can also get these advanced features on iPhone and iPad. Here’s how:
- Open the iOS Settings app.
- Scroll down the left-side navigation pane until you find Safari . Tap on it.
- On the right-side menu, scroll down to the bottom of the screen to find the Advanced option. Tap on it.
- You should now see the Experimental Features menu.
- Tap on it to find a list of experimental features of Safari on iOS.
- The features on the list showing a green toggle button, are the active ones.
- And, those features that display a grey toggle button are inactive.
- You can tap the toggle buttons to activate or deactivate the selected Experimental Features.
You may also want to reset the experimental features of Safari to the default settings in the following scenarios:
- You’re done testing your web app on your iPhone, iPad, and Mac and now need to go back to normal Safari browser features.
- Or, you’ve made some changes in this advanced features section of Safari and now the web browser is behaving differently.
Here’s how you can reset all experimental features to the default values on your MacBook or iMac:
- Go to the Experimental Features context menu from Develop on the Mac toolbar .
- Be sure you opened the Safari app and clicked on it to get the above navigation paths.
- Scroll down to the bottom of the list to find the Reset All to Defaults setting.
- Click on it to restore the Safari application to its original state.
Also read: Safari Not Scrolling on Mac, iPad, iPhone and iPod
If you’ve changed a few experimental features of Safari on iPad or iPhone and wondering how to take back the native browser to its default mode, here’s what you can do:
- Open the Settings app and navigate to Safari > Advanced > Experimental Features .
- Scroll down to the bottom and tap Reset All to Defaults .
The above steps are only available for iOS/iPadOS 15.4 or later. If you’re using an Apple device that’s running on iOS earlier than 15.4, then you need to do the following:
- Note down the advanced Safari features you activate or deactivate.
- Alternatively, take a screenshot of the whole list before making any changes.
- There are no specific buttons to reset Experimental Features to the default setting.
- You must manually deactivate activated features or activate deactivated features.
Also read: Apple’s Changes to Safari in iOS 16
Find below a few experimental features of Safari that you can activate as an end user:
- CSS Spring Animations activates special webpage animations that give a vibe of spring.
- Secure Contexts API to defeat man-in-the-middle attackers from executing robust API calls that can compromise the device’s security.
- Web Animations gives you the power to deactivate or activate website animations. Deactivating web animations can speed up your device.
- SubresourcIntegrity empowers the Safari browser to verify the incoming web content using a secure hash code. The purpose of this action is to verify the integrity of the content. If a hacker tampered with the content while it was in transit, Safari will block it to prevent phishing.
- WebGL 2.0 on macOS and WebGPU on iOS lets you activate or deactivate hardware-accelerated 3D animation rendering on the respective devices.
- Storage API enables you to use the internal storage of an Apple device without compromising the user’s privacy and security.
- FTP support enabled allows you to use file transfer protocol for development purposes on the Safari browser.
- HDR Media Capabilities can let you disable or enable HD content visualization on the Safari browser.
Also read: What Is Safari Prevent Cross-Site Tracking?
Safari Experimental Features: FAQs
Explore some frequently asked questions on the web by other users like you:
If you’re not a web developer or programmer, then you shouldn’t change any Safari Experimental Features. If the Apple Support technicians ask you to turn on any advanced feature linked to Safari errors, you may do so.
You can use the Reset All to Defaults button on macOS and iOS 15.4 or later to let the system activate all the necessary advanced features. There’s no need to manually activate deactivated features.
However, if you’re on an iOS edition older than 15.4, then you must refer to a similar device in which no one changed the Experimental Features yet. Alternatively, contact Apple Support for the best technical assistance on this matter.
You don’t generally need to activate any extra experimental features on your iPhone. However, if you’re running a dated iPhone device and experiencing performance issues while surfing online, do the followings at your own risk.
Deactivate GPU Process: DOM rendering and WebGL, HDR Media Capabilities, ImageBitmap, Lazy image loading, Media Capabilities Extensions, Storage API, and Web Animations.
You shouldn’t turn on any extra experimental features of Safari on macOS and iOS unless you’re a developer. Although, Apple technical support may ask you to activate some experimental features if you contact them with complaints about the Safari web browser.
That’s all about the experimental features of Safari. You can now activate or reset these features by following the steps mentioned so far. You also discovered that these features are only for experts in web app development or programmers. As an end user, there’s no need for you to change any of the experimental features.
Comment below if the article helped you as a developer or end user. Also, share it with your friends and colleagues so they can also learn about the advanced features of Safari.
Next up, essential Safari Extensions for Mac .
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Show 2 Comments
August 2, 2023 at 6:58 AM
Is there a way to stop all this annoying crap that appears on my phone when I try to read a web site. Everything jumps around or the page keeps loading and reloading with various pop ups all over the place. Any advice would be greatly appreciated, thank you.
July 24, 2023 at 11:52 AM
Hi it’s happened again sorry but I’ll give it 1 more go I’m nearly there ok.
Hi, You have disappeared again so I’ll try a 3rd maybe it’s a 4th bug this is the last so I’ll start from the last copy and past ok and hopefully you get the gyst of my story and can help this very simple question!
Hi I seem to keep pushing the wrong button sorry! Not sure what is going on so I will paste what I copied earlier and start again ok after I copy it all again after I paste this (WOW THIS IS FUN!!!!!!!) can’t wait for the crap question Hi, I am not good with computers in fact my wife does most of my computer work mainly because they came out when I left school and then I was hit by a 600 ton excavator in a 350 ton truck and mow have a shorter neck and a bran injury so please bare with me and my spelling and time to explain myself please. So I’ve managed to find an app that block adds called add blocker and while I was setting it up I was looking at some areas in Hawaii to take my wife a stay for her 50th Birthday. But while I was setting up add blocker I found your experimental features and decided that I was an intelligent Technician for 1 minute or until I went to read a write up on a Hawaii resort and clicked to turn the page and read the next page well the writing would not load!, so could you please send me a copy of the default settings so that I can manually reset my Experimental Features to the Default please and I’m very sorry if I’ve sent multiple emails . Like I said I’m not very good with computers sorry. Thank you for your time and patience.
Many thanks and Best wishes
Anthony Rogers. Ps just realised I must have been to close to the bottom of the page so I was hitting the red square which is yep Dibmit bloody hell so sorry!!!
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How to enable or disable experimental features in Safari?
Experimental features in web browsers refer to functionalities currently in the testing phase and are not yet fully stable or standardized. The main purpose of these features is to allow developers and users to experiment with new functionalities and provide feedback before they become mainstream. These features are often available in the beta versions of browsers or within developer tools.
Table of Content
Experimental Features in Safari
Why experimental features, how to enable or disable the feature flags/experimental features.
On Safari 17.0 the "Experimental Features" section has been renamed to "Feature Flags". The Feature Flags (Experimental Features) of Safari give you access to:
- Access to upcoming web tools: Highlights the exciting opportunity to preview cutting-edge browser functionalities.
- Ideas about web element changes: It emphasizes the glimpse into potential future interactions with web elements.
- New browser initiatives: Acknowledges the experimental playground for innovative browser features.
- Behavior adjustments: This points to the ability to fine-tune specific aspects of browsing.
- Under-test development features: Clarifies the experimental nature and ongoing refinement of these features.
There are several reasons why developers include experimental features in software like Safari:
- Gather user feedback: This is probably the most important reason. By making early versions of features available to users, developers can get valuable feedback on their usability, effectiveness, and popularity. This helps them refine the features before officially releasing them, leading to a better user experience for everyone.
- Identify potential issues: Experimental features act as a testing ground to uncover bugs and performance issues before they impact a wider user base. Developers can monitor how users interact with the features and address any problems that arise before the official release.
- Early access for enthusiasts: Some users enjoy being on the cutting edge and trying out new things. Experimental features offer them a chance to be among the first to experience new functionalities and provide feedback that shapes the final product.
Follow the steps to enable or disable on Mac:
Step 1: Open Safari on your Mac
Step 2: Go to Settings by clicking 'Safari' menu available on top left corner next to 'apple icon' or by pressing [ cmd + , ].
Step 3: Navigate to Advanced section.
Step 4: Checkmark the checkbox that says Show features for web developers available on bottom of Advanced Settings window.
Step 5: Now, you should see Developer as wll as Feature Flags section next to Advanced section.
Alternatively, you can access the Feature Flags section by selecting the Develop menu from the options available at the top of the Safari app and then choosing "Feature Flags" from the submenu.
Checked features are active. You can enable or disable the feature by checking the checkbox.
Follow the steps to enable or disable on iOS:
Step 1: Open Setting app on your iPhone.
Step 2: Scroll down until you find Safari and tap on it.
Step 3: Scroll all the way down on Safari Setting on your iPhone, to find the Advanced option and tap on it.
Step 4: Tap on Feature Flags option available on botton of Advanced menu of Safari settings.
Checked features are active. You can enable a feature by checking the checkbox.
The Feature Flags (previously known as Experimental Features) section in Safari is primarily aimed at web developers to test and debug upcoming features. However, some features might offer interesting functionalities for general users as well. It's essential to note it come with certain risks. They may have bugs, security vulnerabilities, or change before reaching a stable release. Users who choose to explore these features should be aware of the potential risks and are encouraged to provide feedback to help shape the development process.
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A Guide to iOS Safari’s Experimental WebKit Features
Experimental WebKit features in iOS are a key part of Apple’s commitment to providing developers with the tools they need to create cutting-edge web experiences within their apps. These features are constantly changing and evolving with each new release of iOS and updates to the Safari app. While they may not be relevant to the average user, they offer valuable debugging capabilities and insights for web developers.
These experimental features can be accessed through the Safari WebKit Experimental Features settings page. However, it’s important to note that these settings are advanced and could impact various aspects of Safari’s configuration. Unless you have a deep understanding of these features and their implications, it’s generally best to stick with the default settings.
For developers, these experimental WebKit features can be incredibly useful. They allow for testing and debugging of upcoming web technologies, ensuring that apps are ready to take advantage of the latest advancements. By toggling these features on or off, developers can fine-tune their web experiences and ensure optimal performance.
It’s worth mentioning that these experimental features are subject to change and may not be supported in future versions of iOS. Therefore, it’s important for developers to stay up to date with the latest documentation and announcements from Apple to ensure compatibility with upcoming releases.
While the average user may not need to tinker with these experimental features, they play a crucial role in pushing the boundaries of web development and enhancing the overall user experience. By providing developers with the tools they need to test and experiment with new technologies, Apple is encouraging innovation and ensuring that iOS remains at the forefront of web development.
Experimental WebKit features in iOS are a powerful resource for developers, allowing them to debug and optimize web experiences within their apps. While they may not be relevant to the average user, they demonstrate Apple’s commitment to supporting and advancing web development on iOS devices.
What Does Experimental WebKit Features Mean on iPhone?
Experimental WebKit features on iPhone refer to the additional functionalities and capabilities that are being tested and developed by Apple for the Safari browser. These features are not fully stable or officially released yet, but are made available for developers to experiment with and provide feedback.
Here are some key points to understand about experimental WebKit features on iPhone:
1. Testing and development: Apple continuously works on improving the Safari browser by introducing new features and enhancements. Experimental WebKit features are a part of this ongoing development process. They are not yet fully implemented or guaranteed to work flawlessly, but they provide developers with a glimpse of what is being worked on and allow them to test and provide feedback.
2. Accessibility to developers: Apple offers these experimental features to developers so they can integrate and test them within their own apps. This allows developers to explore the potential benefits and drawbacks, identify any issues, and provide valuable feedback to Apple. It also helps developers understand how these features can enhance their web experiences within their apps.
3. Debugging and optimization: Experimental WebKit features enable developers to debug and optimize web experiences within their apps. By accessing these features, developers can identify and fix any issues or bugs that may arise when implementing web content in their apps. This ensures a smoother and more efficient browsing experience for users.
4. Commitment to improvement: Apple’s provision of experimental WebKit features showcases their commitment to continuously improving the Safari browser and enhancing the overall web experience on iPhone. By encouraging developers to test and provide feedback on these features, Apple can gather valuable insights and make necessary improvements before officially releasing them.
Experimental WebKit features on iPhone are a way for Apple to test and improve the Safari browser by providing developers with early access to new functionalities. It allows developers to experiment, debug, and optimize web experiences within their apps, while also providing Apple with valuable feedback for further enhancements.
Should You Turn Off Experimental Features in Safari?
Turning off experimental features in Safari is not necessary for regular users who are primarily concerned about privacy and security. These experimental features are mainly designed for developers and may change frequently with different iOS releases and Safari updates. However, if you are a developer or have a specific need to use these experimental features, it is important to understand their implications and potential impact on your browsing experience.
Here are some points to consider when deciding whether to turn off experimental features in Safari:
1. Stability: Experimental features are in the testing phase and may not be as stable as the standard features. They may have bugs or compatibility issues with certain websites or apps. If you rely on Safari for your daily browsing needs, it is generally recommended to stick with the stable and fully supported features.
2. Compatibility: Some experimental features might not be compatible with all websites or web technologies. This could result in certain websites not loading properly or functional issues. If you frequently visit a wide variety of websites, it is advisable to disable experimental features to ensure a consistent browsing experience.
3. Security and Privacy: Experimental features may introduce potential security vulnerabilities or compromise your privacy. As they are still being tested, they may not have undergone the same level of scrutiny and security audits as the stable features. Disabling experimental features can help minimize the risk of encountering security vulnerabilities or privacy concerns.
Regular users who prioritize stability, compatibility, security, and privacy are generally better off disabling experimental features in Safari. However, if you are a developer or have specific needs that require the use of these features, it is crucial to understand their implications and proceed with caution.
What Experimental WebKit Features Should Be Off?
When it comes to experimental WebKit features, it is generally recommended to keep them turned off unless you have a specific need for them. Here are some of the experimental WebKit features that should be turned off:
1. CSS Regions: This experimental feature allows content to flow through multiple layout regions, but it is not well-supported across different browsers and may cause compatibility issues.
2. CSS Exclusions: This feature enables the creation of complex shapes for text wrapping and layout, but it is still in the experimental stage and may not work consistently across browsers.
3. CSS Filters: This feature allows you to apply various visual effects to elements using CSS, such as blurring or adjusting colors. However, it is still being developed and may not have consistent support across different browsers.
4. CSS Shapes: This experimental feature allows you to define the shape of an element’s content area, enabling text to flow around non-rectangular shapes. While it can be useful in certain scenarios, it is not widely supported and may cause compatibility issues.
5. WebRTC: This technology enables real-time communication between browsers, such as video calls or file sharing. While it has great potential, it is still considered experimental and may have security vulnerabilities or compatibility issues.
It’s important to note that experimental features are not fully tested and may not work as expected. They are intended for developers to explore and provide feedback, but should not be relied upon for production websites. Therefore, it is generally recommended to keep these experimental WebKit features turned off unless you have a specific need and are familiar with the potential risks and limitations they may bring.
Remember, always test and verify the compatibility and stability of any experimental feature before implementing it in a live environment.
What is Apple Experimental WebKit?
Apple’s experimental WebKit refers to a collection of advanced settings that can be customized to modify various configuration options within the WebKit framework. WebKit is a browser engine developed by Apple that powers the Safari web browser on Mac, iOS, and other Apple devices.
The experimental WebKit settings page provides access to a range of options that can be tweaked to alter the behavior and performance of WebKit. These settings are typically used by developers and advanced users who have a deep understanding of how the browser engine works and want to experiment with different configurations.
It’s important to note that these settings are not intended for casual users or those without technical expertise. Modifying these settings without proper knowledge can have unintended consequences and may negatively impact the browsing experience or even cause compatibility issues with websites.
By default, most users are advised to leave these experimental settings untouched, as they are already optimized for the best performance and compatibility. Only developers or experienced users who understand the implications of their changes should venture into modifying these settings.
Here are a few examples of the types of settings that can be found on the experimental WebKit settings page:
1. Performance-related settings: – Enable hardware acceleration: Utilizes the device’s hardware capabilities to render web content faster. – Enable fast scrolling: Improves the smoothness and responsiveness of scrolling within webpages. – Enable CSS animation smooth scrolling: Enhances the animation effects during scrolling.
2. Privacy and security settings: – Enable experimental features: Allows the testing of new features that may enhance privacy and security. – Control website tracking: Provides options to limit or block cookies and other tracking mechanisms.
3. Developer-oriented settings: – Enable remote debugging: Enables remote debugging of web content for developers. – Enable experimental features in the Web Inspector: Allows testing and access to experimental features within the developer tools.
It’s worth reiterating that these settings should only be modified by individuals who are familiar with their implications and have a specific need or purpose in mind. Modifying these settings without proper knowledge can lead to unexpected results and potential issues.
The experimental webkit features in iOS offer developers the opportunity to enhance and debug their web experiences within their apps. These features are constantly evolving and are updated with each release of iOS and Safari app update. While these experimental features may seem enticing, it is important to note that they are primarily designed for developers and not necessary for regular users.
For the average user, there is no need to tamper with the experimental webkit features in order to configure Safari for better privacy or performance. Unless you have a specific need for a non-common web application that requires a specific experimental feature, it is advisable to leave these settings at their default values.
The “experimental webkit settings” page may be misleadingly named, as it contains advanced settings that can have a significant impact on various configuration items. Unless you are well-versed in these settings and know exactly what you are doing, it is recommended to avoid making changes to them.
The experimental webkit features demonstrate Apple’s commitment to supporting developers and improving the web experience on iOS. However, for the average user, it is best to leave these features untouched and trust in the default settings provided by Apple.
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WebKit Features in Safari 16.0
Sep 12, 2022
by Jen Simmons
Today, we are excited to announce the release of Safari 16.0 for iOS 16, macOS Monterey and macOS Big Sur. This release contains quite a few new web technologies that web developers can use to make their sites and web apps even better.
To update to Safari 16.0 on macOS Monterey and macOS Big Sur, go to System Preferences → Software Update → More info. To update to Safari 16.0 on iOS, install iOS 16 . Safari 16 for macOS Ventura and iPadOS 16 are coming this October, and will include Web Push on macOS Ventura.
We announced many details about what’s in Safari 16 in our article, News from WWDC22: WebKit Features in Safari 16 Beta , and the WWDC22 session, What’s new in Safari and WebKit (32 min video). But that’s not all. In the months since WWDC, we’ve added even more.
New since Safari 16 Beta 1
Safari for iOS 16 includes support for still images compressed using the AVIF format. Developed by the Alliance for Open Media , AVIF is an alternative to image formats like JPEG, PNG, GIF, or WebP. It offers multiple color spaces, lossless and lossy compression, and more. Support for AVIF will also come to macOS Ventura and iPadOS in October.
WebKit now fully supports the resolution media query . This media query provides a way for web developers to conditionally apply CSS based on the pixel density of a screen. For example: @media (min-resolution: 326dpi) { } .
WebKit now supports text-align-last , a CSS property that sets how the last line of a text block is aligned. For instance, a paragraph could have text-align: center applied to most its lines, while the last line of that paragraph is aligned right with text-align-last: right .
The :has() pseudo-class in WebKit now supports :target . The CSS :target pseudo-class selects an element when that element has an id that matches a fragment in the URL. For example, if a user clicks on a link that takes them to example.com/#chapter2 , and an element on that page has the ID #chapter2 , then the :target pseudo-class will select that element. In Safari 16, :has(:target) opens up new possibilities when using URLs with fragments. For an in-depth look at :has , read Using :has() as a CSS Parent Selector and much more .
Safari on iOS 16 adds support for passkeys . They provide users with an incredibly easy way to log in, while delivering a profound increase in security .
The technology that makes passkeys possible is defined in open standards from the FIDO Alliance and the W3C, including the WebAuthn standard, which already has widespread support in browsers . Passkeys are an industry-wide effort, and “passkeys” is a common noun, to be used by anyone. You can offer passkeys alongside your existing authentication options. First, teach your backend to store public keys and issue authentication challenges. Then, on your website or web app, offer passkeys to users by adopting the APIs for creating new passkeys and allowing users to sign in with their passkey.
If your website or web app already supports using a platform authenticator with WebAuthn, there are a few things to note as you add support for passkeys. Make sure you aren’t limiting signing in to the device that saved the passkey; that is, don’t use a cookie to “remember” that a user set up a key on a particular device. Also, make sure the username fields in your existing sign-in forms are compatible with AutoFill by adopting “conditional mediation”. Finally, start to refer to passkeys, and treat them as a primary way to sign in.
To learn more, watch the WWDC22 session, Meet Passkeys (27 min video) or read Supporting passkeys . In October, support for passkeys will come to macOS Monterey and macOS Big Sur, as well as macOS Ventura and iPadOS.
Safari 16 adds Apple Pay support for Merchant Tokens, a more efficient way to support recurring payments, and support for multi-merchant payments, a way to pay multiple merchants of record in one transaction. Safari 16 also supports Order Tracking to enable merchants on the web to provide detailed order and shipping information in Wallet. Apple Pay can now be used in all WKWebView .
Web Inspector Extensions
Safari 16 brings support for Web Inspector Extensions, enabling you to enhance Safari’s built-in web developer tools. Download these extensions on macOS by going to Safari > Safari Extensions and looking for Web Inspector Extensions in the App Store. Search for developer tools from your favorite third-party developer services, test suites, and frameworks — including Angular DevTools, which recently announced support. If you’d like to learn how to make such extensions, watch the WWDC22 session, Create Safari Web Inspector Extensions (18 min video).
Safari 16 includes even more for Safari Web Extensions, including the ability to sync which extensions are enabled across iOS, iPadOS, and macOS. Safari 16 supports both manifest version 2 and manifest version 3. Watch What’s new in Safari Web Extensions from WWDC22 to learn about the differences, and how to upgrade your extension. Web Extensions in Safari 16 also add support for declarativeNetRequestWithHostAccess permission and browser.runtime.getFrameID .
Container Queries
Similar to Media Queries, Container Queries allow you to adjust the layout or styling of a particular item on your web page based on the size of its container rather than the size of the viewport. Safari 16 supports size queries and container query units . “Size queries” are what web developers imagine when they talk about Container Queries — the opportunity to write CSS that only applies if a container is a certain size. Container Query Units are similar to Viewport Units, but they specify a length relative to the dimensions of a query container instead of the viewport. These include cqw , cqh , cqi , cqb , cqmin , and cqmax .
CSS Grid revolutionized what’s possible in layout design on the web. Subgrid takes Grid to another level, providing an easy way to put grandchildren of a grid container on that grid. It makes it possible to line up items across complex layouts without being constrained by the HTML structure. And Safari’s Grid Inspector lets you turn on the overlays for as many grids as you want — which is especially helpful when coding subgrid.
Web Inspector
Following last year’s addition of Grid Inspector, Safari 16.0 adds Flexbox Inspector. It pairs perfectly with the addition of Alignment Editor in Safari 15.4.
Safari’s Flexbox Inspector visually distinguishes between excess free space and Flex gaps. It also shows the boundaries of items, revealing how they are distributed both on the main axis and the cross axis of your Flexbox containers. The toggleable “Order Numbers” option show the layout order of elements in the container, which can be helpful when using the order property. And just like our overlays for Grid last year, you can simultaneously show as many Flexbox overlays as you want, without any impact on scrolling performance. A single checkbox turns them all on.
In the Timelines Tab there are additional links to reference documentation, and a new experimental Screenshots timeline that captures screenshots of the viewport when content changes are painted.
The Elements Tab now supports showing Container Queries in the Styles sidebar.
The Sources Tab brings new improvements including allowing local overrides for requests to use regular expression matches in the redirect URL and local overrides for responses now being able to be mapped to a file on disk.
The Network Tab includes a new proxy indicator, and provides a way to entirely block network requests.
Accessibility Improvements
Safari 16 introduces a re-architecture of WebKit’s accessibility support on macOS. By adding Isolated Tree Mode, WebKit reduces VoiceOver hangs by offloading accessibility work to a secondary thread, improving performance and increasing responsiveness. This change allows WebKit to service more accessibility requests from clients like VoiceOver in less time than before. On some complex webpages, we’ve measured twice the number of accessibility requests served in twenty-five percent less time. Safari 16 also greatly improves accessibility support for elements with display:contents by ensuring they are properly represented in the accessibility tree.
Animation Improvements
WebKit now supports CSS Offset Path (also known as Motion Path), providing web developers the ability to animate objects along a custom path of any shape. The offset-path property lets you define a geometrical path along which to animate. The offset-anchor , offset-distance , offset-position , and offset-rotate properties give you additional abilities to refine the exact movement of the object being animated. While the offset property acts as a shorthand for combining these properties.
In Safari 16, you can now animate track sizes in CSS Grid, dynamically changing the size of rows and columns.
Safari 16 also adds support for composite operations, resolving how an element’s animation impacts its underlying property values. And it adds support for discrete animation to thirty-nine CSS properties.
Overscroll Behavior
CSS Overscroll Behavior determines what happens when a user scrolls and reaches the boundary of a scrolling area. It’s useful when you want to stop scroll chaining — when a user scrolls inside a box and hits the end, you now have control over stopping or allowing scrolling on the rest of the page.
Shared Workers
WebKit now supports Shared Workers . It’s similar to Service Workers, running JavaScript in the background, but its lifetime is slightly different. Your Shared Worker runs as long as the user has any tab open to your domain. All the tabs open to the same domain can share the same Shared Worker.
Additional Features
Safari 16 adds support for Shadow Realms, <form>.requestSubmit() , the showPicker() method for HTML input elements, and the worker-src Content Security Policy directive.
Fixes and Polish
Safari 16.0 also contains quite a few bug fixes and feature polish.
- Fixed gradient color interpolation with alpha.
- Removed most non-standard CSS appearance values.
- Polished the implementation of the :has() pseudo-class, updated to match the evolving web standard.
- Polished the implementation of Cascade Layers.
- Fixed firing the load event after a form is submitted with a "_blank" target.
- Fixed contenteditable anchors getting stuck with an :active state.
- Fixed changing the value for stepUp() and stepDown() with out-of-range values.
- Fixed using min as the default value when min is greater than max for <input type="range"> .
- Fixed making value updates visible for <input type="email"> .
- Fixed making sure :active is removed on keyup event for radio inputs.
- Fixed applyStep() behavior to align with specifications.
- Fixed the select() method returns to align with specifications.
- Fixed form data generated by <input type="image"> when a value attribute is present.
- Fixed the FormData object to not include an entry for the submit button used to submit the form.
- Fixed returning an empty string for invalid floating-point numbers that end with a "." .
- Fixed selection range after the type attribute of an <input> changes.
- Fixed selection range to be limited by the length of the current value.
- Fixed the user-agent stylesheet to include table { text-indent: initial } to align with specifications.
- Fixed the user-agent stylesheet to include box-sizing: border-box for <input type="color">.
- Fixed the line-height declaration to use !important for the placeholder of an input.
- Fixed blocking image content in object elements.
- Fixed incorrect CORP/COEP check in 304 responses.
- Fixed mixing strict-dynamic and unsafe-inline policies.
- Fixed script-src-elem policies in Workers.
- Fixed incorrect blocked-uri for inline scripts and strict-dynamic policies.
- Fixed handling AllowShared TypedArray .
- Fixed breakpoints not triggering, breakpoints occurring at incorrect locations in scripts, and incorrect error/stack trace line/column numbers when inspecting minified sources with multi-line strings.
- Fixed importing Timelines sometimes not scrolling.
- Fixed importing Audits sometimes crashing.
- Fixed CSS autocomplete to suggest the most commonly-used property, not the alphabetical one.
- Fixed pointerMove actions to correctly fire mouse events.
- Fixed rapid session creation and deletion leading to timeouts in session creation.
Safari Web Extensions
- Fixed incorrect counts being returned from getBytesInUse .
- Extensions that request the unlimitedStorage permission no longer also need the storage permission.
- Updated the maximum number of static rulesets to 50 and the maximum number of enabled static rulesets to 10.
- Service workers are no longer returned from extension.getBackgroundPage and extension.getViews
We love hearing from you. Send a tweet to @webkit , @jensimmons , or @jonathandavis to share your thoughts on Safari 16. If you run into any issues, we welcome your feedback on Safari UI, or your WebKit bug report about web technology or Web Inspector. Filing issues really does make a difference.
Download the latest Safari Technology Preview to stay at the forefront of the web platform and to use the latest Web Inspector features. You can also use the WebKit Feature Status page to watch for new information about the web features that interest you the most.
To learn more about what’s in Safari 16 for web developers, read the Safari 16 Release Notes .
Home » Tech Tips » Browsers » How to Enable Experimental Features in Safari Mac and iPhone?
How to Enable Experimental Features in Safari Mac and iPhone?
As with any software development, browsers also follow a life cycle for introducing new features. Edge and Chrome browsers offer beta, developer and canary channels for previewing or testing features before they are available for public use. In addition, you can use flags to test experimental features on the stable version. Though Safari browser does not offer different channels, you can enable experimental features on the stable version from the settings page both on Mac and iPhone/iPad.
Why You Need Experimental Features in Safari?
Safari is a platform dependent browser that works only on Apple devices. Due to this fact, common features that work on Chromium based browsers may not work on Safari unless Apple enable support for them. For example, Chrome by default uses QUIC protocol with HTTP/3 support. This HTTP/3 feature is an experimental feature as of Safari 16 in iOS/macOS. If your organization has an infrastructure to use QUIC protocol , then you should enable that HTTP/3 experimental feature in Safari. Otherwise, functionalities related to QUIC will not work on Safari while they work fine on Chrome.
Enable Experimental Features in Safari Mac
To use experimental features, you should first enable “Develop” menu.
- Open Safari and go to “Safari > Settings…” menu.
- Go to “Advanced” section and enable “Show Develop menu in menu bar” option.
- Now, you will see “Developer” and “Feature Flags” tabs are added in Safari settings. Go to “Developer” tab and customize the developer options which you want to use.
- There will also be a new “Develop” menu added in Safari’s top menu bar.
- Open any website and go to “Develop > Feature Flags” menu to go back to the flags settings section.
- You will see a huge list of features and some of them are enabled by default.
- Use the search box to filter items and click the checkbox in front of any item to enable it.
- You can find whether the flag is testable, stable or in preview mode under the last column.
- If you have enabled or disabled too many items in the list, click on the “Reset Feature Flags” option. This will reset the experimental features section to its initial settings.
You can expect “Stable” flags will be removed and become part of the default Safari app sooner. As mentioned above, HTTP/3 experimental flag available in Safari 16 has been removed and now it becomes part of default Safari 17.
Note that Apple changed the experimental features settings in Safari 17 version. On earlier versions, you can enable the flags from “Develop > Experimental Features” menu without going to settings section. Now, you need to do this from “Feature Flags” settings tab.
Enable Experimental Features in Safari iPhone
You can also enable or disable experimental features in Safari iPhone or iPad app.
- Open “Settings” app and scroll down to find “Safari” option.
- Tap on it to open Safari settings page.
- Scroll down to the bottom and tap on “Advanced” option.
- On the next page, tap on “Experimental Features” showing as a last option.
- You will see a huge list, turn the switch on or off the enable or disable the required features.
- Like macOS, scroll to bottom of the list and tap “Reset All to Defaults” to reset experimental features list to its original state.
How to Know the List of Experimental Features?
Apple uses WebKit browser engine and release new WebKit experimental features frequently. You can get the latest updates from the Apple’s official WebKit blog . For example, Safari version 16 includes important features like Web Push to use push notifications, Passkeys, Apple Pay support, lazy loading of images and support for installing Web Inspector Extensions.
Final Words
There are many experimental features enabled by default both in Mac and iPhone. Do not change the default settings unless you know what you are doing. Otherwise, it may break some websites or does not allow the browser to work properly. Good thing is that you can easily reset experimental features list to original settings and bring the site or browser to working condition.
About Nagasundaram Arumugham
Naga is the founder and chief content editor of WebNots. He has over 20 years of experience in technology field and published more than 2000 articles.
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Experimental features menu seems to have been disappeared from Safari 17.2’s experimental features menu How to find the same commands ? thanks
Now, all experimental flags are moved under “Feature Flags” settings tab section in Safari. The article is updated accordingly.
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How To : Reset Safari's Experimental Features to the Defaults to Fix or Troubleshoot Browsing Issues
Safari's advanced experimental features give you access to new browser initiatives, upcoming web tools, element changes, behavior adjustments, and other preliminary feature tests in development by Apple. If you use them on your iPhone, you can either improve your Safari experience or wreck it. Resetting the flags provides a fresh start.
Why Use Safari's Experimental Features?
Web developers and WebKit engineers benefit the most from Safari's experimental features menu since they can try out new features in development. They can then provide feedback to Apple to help the company refine and eventually implement those features in a future Safari release. However, regular iPhone users can use all the experimental features just the same.
Experimental Safari WebKit flags that are disabled by default are still being tested internally by Apple and aren't always ready for developer use. In contrast, the enabled ones are fair game for anyone. Many experimental features are useful, like preloading responsive images for faster display, lazy-loading images to reduce bandwidth, and making jump links smoother .
I'm particularly excited about "Scroll to Text Fragment," which would make Safari recognize links that highlight specific text within the webpage like Chrome currently does. Another is "Link Sanitizer," which would presumedly either remove bloat from hyperlink redirects or invalidate hyperlinks for security analysts to avoid opening up malicious content.
How Do You Reset Safari's Experimental Features?
If you like playing around in Safari's advanced experimental settings, whether you're a web developer or just a regular user trying to up your browsing game, things can get out of control fast.
For years , you could easily reset all of Safari's experimental flags back to their defaults on macOS; just go to "Develop" in Safari's menu bar, then choose "Reset All to Defaults" from the "Experimental Features" menu. On iPhone and iPad, it didn't show up until iOS 15.4 and iPadOS 15.4 . Before that, users would resort to asking for screenshots of the default flag settings so they could manually change them back one by one.
Navigate to Settings –> Safari –> Advanced –> Experimental Features, and then scroll to the bottom and tap "Reset All to Defaults." There is no confirmation prompt to deal with, so it immediately returns all the settings to the defaults.
Just updated your iPhone? You'll find new Apple Intelligence capabilities, sudoku puzzles, Camera Control enhancements, volume control limits, layered Voice Memo recordings, and other useful features. Find out what's new and changed on your iPhone with the iOS 18.2 update.
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Safari ‘experimental features’ default
I have messed up with ‘experimental features’ and many websites don’t work properly on Safari.
Could anyone on iOS 14.6 share the default setting please?
There are some screenshots of older versions but looks like the items are different. Thank you!
Posted on Jun 17, 2021 8:38 AM
Posted on Jun 17, 2021 11:44 AM
Last item on each block and the first item on the next block are repeated to keep the continuity intact.
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Oct 5, 2023 · Experimental WebKit features in Safari demonstrate Apple’s commitment to innovation and collaboration with developers. By providing early access to new web technologies, Apple empowers ...
Mar 21, 2023 · Hover the cursor over the Experimental Features option to visualize all the active and inactive experimental features of Safari. Active ones show a checkmark and inactive ones don’t. If you need to activate any special features from this list, simply scroll the list, find the feature you want, and click it to enable the selected feature.
Feb 13, 2024 · Experimental Features in Safari. On Safari 17.0 the "Experimental Features" section has been renamed to "Feature Flags". The Feature Flags (Experimental Features) of Safari give you access to: Access to upcoming web tools: Highlights the exciting opportunity to preview cutting-edge browser functionalities.
Mar 27, 2023 · Support for the lock() and unlock() methods remain experimental features for the time being. If you’d like to try them out, you can enable them in the Settings app on iOS and iPadOS 16.4 via Safari → Advanced → Experimental Features → Screen Orientation API (Locking / Unlocking). Screen Wake Lock API
May 13, 2024 · To do so, WebKit also needs to support animation of the display property, which has not yet shipped in Safari. You can test this use case today in Safari Technology Preview. Features queries for importing CSS. WebKit for Safari 17.5 adds the supports() syntax to @import rules. Now you can conditionally import CSS files based on whether or not ...
Nov 14, 2023 · 4. Commitment to improvement: Apple’s provision of experimental WebKit features showcases their commitment to continuously improving the Safari browser and enhancing the overall web experience ...
Sep 12, 2022 · Additional Features. Safari 16 adds support for Shadow Realms, <form>.requestSubmit(), the showPicker() method for HTML input elements, and the worker-src Content Security Policy directive. Fixes and Polish. Safari 16.0 also contains quite a few bug fixes and feature polish. CSS. Fixed gradient color interpolation with alpha.
Jan 19, 2024 · Like macOS, scroll to bottom of the list and tap “Reset All to Defaults” to reset experimental features list to its original state. How to Know the List of Experimental Features? Apple uses WebKit browser engine and release new WebKit experimental features frequently. You can get the latest updates from the Apple’s official WebKit blog ...
Mar 14, 2022 · Experimental Safari WebKit flags that are disabled by default are still being tested internally by Apple and aren't always ready for developer use. In contrast, the enabled ones are fair game for anyone. Many experimental features are useful, like preloading responsive images for faster display, lazy-loading images to reduce bandwidth, and ...
Jun 17, 2021 · What are the default settings for Safari Experimental WebKit Features? (RE: iPhone 8, iOS 15.1 [updated today]) What are the default settings for Safari Experimental WebKit Features? (RE: iPhone 8, iOS 15.1 [updated today]) I now know it would have been best not to alter the settings.