Table of Contents

  • Introduction
  • The Power of Safari 17
    • JPEG XL: A Game Changer for Page Speed Optimization
    • Font Size Adjust: Enhancing User Experience and Consistency
  • Embracing Change: Reimagining SEO Strategies with Safari 17
    • Image Optimization
    • Website Design
    • Performance Tracking
  • Conclusion


In today’s fast-paced digital world, website performance is paramount. Users expect fast-loading pages and smooth browsing experiences. To meet these demands, Apple has unveiled Safari 17, a browser update that introduces groundbreaking features designed to enhance user experience (UX) and page speed optimization. This article will explore two key features of Safari 17: the support for JPEG XL and expanded capabilities of font-size-adjust. We will also delve into the implications these updates have on SEO strategies and website optimization.

The Power of Safari 17

JPEG XL: A Game Changer for Page Speed Optimization

One of the most exciting features of Safari 17 is its support for JPEG XL, a revolutionary image format that balances image quality and file size. JPEG XL enables the recompression of existing JPEG files without compromising image quality, resulting in significant file size reductions of up to 60%. This reduction in file size has a direct impact on page loading speed, a crucial factor considered by search engines when ranking websites.

With JPEG XL, publishers can now optimize their website’s images, leading to faster page loads and improved user experiences. Furthermore, Safari 17’s support for progressive loading in JPEG XL means that users can start viewing images before the entire file is downloaded. This improvement is particularly beneficial for websites targeting regions with slower internet speeds, as it enhances user experience and potentially reduces bounce rates.

Font Size Adjust: Enhancing User Experience and Consistency

Safari 17 also introduces expanded capabilities for the font-size-adjust CSS property, which ensures consistent text display across different fonts. By allowing developers to pull the sizing metric from the main font and apply it to all fonts, Safari 17’s font-size-adjust property helps maintain a consistent visual aesthetic. This is particularly important for user experience, as websites with clear and consistent text display are more likely to provide a better overall experience.

The expanded capabilities of font-size-adjust in Safari 17 offer more flexibility in adjusting different font metrics, accommodating a broader range of languages and design choices. Websites that prioritize consistent and clear text display, regardless of the font in use, are expected to provide a better user experience. This, in turn, can result in longer visits and increased engagement.

Embracing Change: Reimagining SEO Strategies with Safari 17

With the introduction of Safari 17, SEO professionals need to adapt their strategies to leverage the browser’s new capabilities fully. This section will explore a few key areas where adjustments may be necessary.

Image Optimization

JPEG XL support in Safari 17 presents an opportunity for SEO professionals to optimize their website’s images. By converting existing JPEG files to the JPEG XL format, website owners can significantly reduce image file sizes without compromising quality. This optimization directly impacts page loading speed, which can positively influence search engine rankings and user experience. SEO professionals should consider reformatting their website images to JPEG XL to take advantage of this powerful feature.

Website Design

The expanded capabilities of font-size-adjust in Safari 17 necessitate a reevaluation of design strategies. Consistent font sizes across different languages and devices are crucial for improving Core Web Vitals, important metrics considered by search engines for ranking websites. SEO professionals should work with web designers to ensure that fonts are selected and implemented in a way that maintains visual consistency and enhances user experience.

Performance Tracking

As with any major browser update, it’s essential to closely monitor the impact of Safari 17 on website performance metrics. SEO professionals should track key performance indicators such as page loading speed, bounce rates, and user engagement to understand how Safari 17’s new features affect their websites. Regular performance tracking and analysis will help identify areas for improvement and optimize SEO strategies accordingly.


Apple Safari 17 introduces powerful features that have the potential to revolutionize user experience and page speed optimization. The support for JPEG XL enables significant file size reductions and faster page loads, while the expanded capabilities of font-size-adjust enhance text display consistency. SEO professionals must adapt their strategies to leverage these new features fully. By optimizing images, reevaluating website designs, and closely monitoring performance metrics, SEO professionals can leverage Safari 17 to improve search engine rankings and provide better user experiences. Embrace the power of Safari 17 and unlock the potential for enhanced website performance.