"Safari 26.3 is here, with practical improvements for performance and user experience. This release gives you new tools for optimizing how your content is delivered and better control over navigation in single-page applications. We've also fixed issues developers have run into with anchor positioning, multi-column layouts, and other features - making them more robust and reliable. Plus, we've refined the everyday browsing experience by fixing issues we found while testing real websites."
"Safari 26.3 supports Zstandard (Zstd), a compression algorithm you can use to make your website's files smaller before sending them to browsers. Like gzip and Brotli, it compresses text-based assets - HTML, CSS, JavaScript, JSON, and SVG - so less data travels over the network. Zstandard decompresses quickly, reducing the workload on users' devices. It also compresses fast enough to do on-the-fly, whereas Brotli is typically pre-compressed during your build process."
Safari 26.3 introduces practical improvements for performance, content delivery, and single-page application navigation. Fullscreen video playback in visionOS now dims the surrounding environment to focus on video content. Zstandard (Zstd) compression is supported for text-based assets, offering fast compression and decompression suitable for on-the-fly use; servers should send Content-Encoding: zstd and will fall back for unsupported browsers. Zstandard support is available on iOS 26.3, iPadOS 26.3, visionOS 26.3, and macOS Tahoe 26.3 but not on earlier macOS releases. Additional fixes improve anchor positioning, multi-column layouts, and general browsing reliability.
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