Apple Releases Safari Technology Preview 197


Apple continues to push the boundaries with its latest release of Safari Technology Preview Version 197 brings a host of improvements and bug fixes that promise to enhance the web development experience on Apple platforms. This article delves into the key features and changes introduced in this release, exploring how they impact developers and end-users alike.

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What is Safari Technology Preview?

Before we dive into the specifics of version 197, let’s briefly recap what Safari Technology Preview is and why it matters to the web development community.

A Glimpse into the Future of Web Technologies

Safari Technology Preview is a cutting-edge version of Apple’s web browser that provides developers with an early look at upcoming web technologies. It serves as a testing ground for new features and improvements that may eventually make their way into the stable release of Safari.

Key Benefits for Developers

  • Early access: Developers can experiment with the latest HTML, JavaScript, and CSS features before they become widely available.
  • Powerful developer tools: The preview includes advanced tools like Web Inspector and Responsive Design Mode.
  • Compatibility testing: It allows developers to ensure their web applications work seamlessly with upcoming Safari updates.
  • Feedback opportunity: Developers can report issues and provide feedback to Apple, potentially influencing the direction of web standards implementation.

Safari Technology Preview 197: What’s New?

The latest release, Safari Technology Preview 197, includes WebKit changes between commits 279361@main and 279854@main. This update is available for download on macOS Sequoia beta and macOS Sonoma, offering developers a chance to explore and test the latest improvements.

Notable Changes and Resolved Issues

Let’s explore some of the most significant updates in this release:

1. OffscreenCanvas Improvements

Fixed: A detached OffscreenCanvas will no longer transfer an ImageBuffer.

This fix addresses potential memory leaks and improves performance when working with offscreen canvases, which are particularly useful for web workers and background rendering tasks.

2. Enhanced RTL Support for Custom Counter Styles

Fixed: Custom counter styles disclosure-open and disclosure-closed now point to the correct direction in right-to-left (RTL) layouts.

This improvement ensures better support for RTL languages, enhancing the user experience for a global audience.

3. Form Control Appearance Refinements

Fixed: Form controls no longer draw with an active appearance when the window is inactive.

This visual enhancement provides a more accurate representation of the form’s state, improving user interface consistency.

4. Intl.DurationFormat Precision Adjustment

Fixed: The fractionalDigits of Intl.DurationFormat is now treated as at most 9 digits if omitted.

This change aligns Safari’s implementation with the ECMAScript Internationalization API specification, ensuring consistent behavior across platforms.

5. Audio Worklet Distortion Resolution

Fixed: Multiple cases of audio distortion occurring when using AudioWorklets have been addressed.

This fix significantly improves the quality and reliability of audio processing in web applications that utilize AudioWorklets for real-time audio manipulation.

6. Enhanced Security with CORS Bypass Fix

Fixed: A CORS bypass on private localhost domain using host and mode “no-cors” has been resolved.

This security enhancement prevents potential vulnerabilities related to Cross-Origin Resource Sharing, strengthening the overall security of web applications.

7. Web Inspector Enhancements

Fixed: Web Inspector now shows nested workers and features improved Accessibility inspector for switch controls.

These improvements provide developers with better insights into their web applications’ structure and accessibility features.

Impact on Web Development

The changes introduced in Safari Technology Preview 197 have far-reaching implications for web developers. Let’s explore how these updates can influence various aspects of web development:

1. Performance Optimization

With fixes related to OffscreenCanvas and audio processing, developers can expect improved performance in graphics-intensive applications and audio-based web experiences. These enhancements allow for more efficient resource utilization and smoother user interactions.

2. Internationalization and Accessibility

The improvements in RTL support for custom counter styles and the refinements to the Accessibility inspector demonstrate Apple’s commitment to creating a more inclusive web. Developers can now more easily create applications that cater to a global audience and meet accessibility standards.

3. Security Enhancements

The resolution of the CORS bypass issue reinforces the importance of security in web development. Developers can now have greater confidence in the security of their applications when running on localhost environments.

4. Developer Productivity

The enhancements to Web Inspector, including better visibility of nested workers, streamline the debugging process. This allows developers to identify and resolve issues more quickly, ultimately leading to faster development cycles.

5. Standards Compliance

By aligning implementations with specifications, such as the adjustment to Intl.DurationFormat, Safari Technology Preview 197 helps developers create more consistent experiences across different browsers and platforms.

Best Practices for Developers

To make the most of Safari Technology Preview 197, developers should consider the following best practices:

  • Regular testing: Frequently test your web applications with the latest preview to catch potential issues early.
  • Feedback submission: Report any bugs or unexpected behavior to Apple to contribute to the improvement of Safari and WebKit.
  • Feature exploration: Experiment with new features and APIs to stay ahead of the curve in web development.
  • Cross-browser compatibility: While testing with Safari Technology Preview, ensure your applications remain compatible with other major browsers.
  • Performance profiling: Utilize the improved developer tools to optimize your application’s performance.

The Road Ahead: Future of Web Development on Apple Platforms

Safari Technology Preview 197 offers a glimpse into the future of web development on Apple platforms. As web technologies continue to evolve, we can expect to see:

  • Enhanced support for modern web APIs: Apple is likely to expand support for cutting-edge web technologies, enabling more powerful web applications.
  • Improved performance: Future releases may focus on further optimizing Safari’s rendering engine and JavaScript performance.
  • Advanced developer tools: We can anticipate more sophisticated debugging and profiling tools to aid developers in creating high-quality web experiences.
  • Stronger security measures: As web applications become more complex, Safari will likely introduce additional security features to protect users and data.
  • Better integration with Apple ecosystem: Future updates may provide deeper integration between web technologies and native Apple platform features.


Safari Technology Preview 197 represents another step forward in Apple’s commitment to advancing web technologies. By addressing key issues and introducing refinements across various areas, this release empowers developers to create more robust, efficient, and inclusive web experiences.

As web development continues to evolve, staying up-to-date with the latest browser technologies is crucial. Safari Technology Preview serves as an invaluable tool for developers looking to push the boundaries of what’s possible on the web while ensuring compatibility with Apple’s ecosystem.

By embracing the changes and improvements introduced in this release, developers can stay ahead of the curve and deliver cutting-edge web applications that leverage the full potential of modern web standards.

Useful Table: Key Features and Improvements in Safari Technology Preview 197

Feature/ImprovementDescriptionImpact on Development
OffscreenCanvas FixPrevents ImageBuffer transfer in detached OffscreenCanvasImproved memory management and performance for background rendering tasks
RTL Custom Counter StylesCorrected direction for disclosure-open and disclosure-closed stylesEnhanced support for right-to-left languages and layouts
Form Control AppearanceInactive window state now correctly reflectedBetter visual consistency and user interface accuracy
Intl.DurationFormat PrecisionLimited to 9 digits when fractionalDigits is omittedImproved consistency with ECMAScript specifications
AudioWorklet Distortion FixResolved multiple cases of audio distortionHigher quality audio processing in web applications
CORS Bypass Security FixAddressed vulnerability on private localhost domainsEnhanced security for local development environments
Web Inspector EnhancementsImproved visibility of nested workers and accessibility featuresStreamlined debugging and accessibility testing process

This table provides a quick reference for developers to understand the key improvements in Safari Technology Preview 197 and their potential impact on web development practices.

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