Introducing Interop 2025: Promotes consistent adoption of standards. Safari has implemented many included standards. Focus areas for 2025 include Anchor Positioning, Backdrop-filter, Core Web Vitals, etc.

• Anchor Positioning: Allows elements to be anchored relative to others. Work-in-progress in WebKit, available in Safari Technology Preview.
• Backdrop-filter: Applies graphical effects to background. Updated in Safari 18.0, more work needed for full interoperability.
• Core Web Vitals: Focus on metrics like Largest Contentful Paint and Interaction to Next Paint for better user experience.
• <details> Element: Enhances support for expandable content sections and related elements.
• Layout: Flexbox & Grid: Continued focus on improving interoperability.
• Modules: JSON and Import Attributes: About modularity in JavaScript with JSON imports and refined import attributes.
• Navigation API: Manages user state in web apps. Implemented in WebKit and available in Safari Technology Preview.
• Pointer and Mouse Events: Handles user input. Safari improved significantly last year and more tests added for 2025.
• Remove Mutation Events: Phasing out deprecated mutation events in favor of MutationObserver API.
• @scope: Applies styles within specific DOM subtrees. Shipped in Safari 17.4.
• scrollend Event: Fires when scrolling finishes, useful for triggering actions. Not in Safari yet.
• Storage Access API: Focuses on new methods for user data privacy.
• Text Decoration: Ensures interoperability for various text decoration properties.
• URLPattern: Defines and matches patterns against URLs.
• View Transitions: Animates page state changes. Supported in Safari 18.0 and 18.2.
• WebAssembly: Enhances Wasm integration with the DOM.
• Web Compat: Focuses on web compatibility issues with various CSS and DOM properties.
• WebRTC: Improves direct peer-to-peer communication features.
• Writing Modes: Defines text layout direction. Includes new aspects like sideways-lr and sideways-rl.