This allows for more power efficient implementations of website behaviors like lazily loaded images that also work for cross-origin content. This makes it possible for developers to avoid costly polling techniques that waste battery to periodically compute the position of an element compared to another element or the viewport. The Intersection Observer API provides a way for developers to know when a particular element on a page becomes visible. Learn more about the changeType() method in the Media Source Extensions Codec Switching feature incubation specifications. This means developers can dynamically switch between codecs and containers within a single SourceBuffer rather than switching between multiple MediaSource instances which can cause noticeable delays in the transition. New in this release, WebKit now supports transitioning codecs or bytestream containers using a new changeType() method on SourceBuffer. With MSE, media streams can be created and controlled by JavaScript. It provides web-based streaming of audio and video media content.

Media Source Extensions have been supported by WebKit on macOS since Safari 8. See the Encrypted Media Extensions standards specifications for more information. Developers are encouraged to use feature detection to determine if the prefixed or the non-prefixed version of the API is available to ensure compatibility with older versions.

The modern EME implementation includes a number of web developer features and conveniences not found in the original, prefixed API. This updated version also no longer uses a webkit- prefix. WebKit has an updated implementation of the Encrypted Media Extensions (EME) API for providing encrypted video or audio content. More details about these WebRTC improvements in WebKit are available in the blog post вЂњ On the Road to WebRTC 1.0, Including VP8вЂќ. Because H.264 has hardware support on Apple hardware and has been tuned for power efficiency, WebKit continues to use H.264 as its default codec in WebRTC for a better user experience. The codec improves website compatibility, permitting video exchange with a wider range of WebRTC endpoints. WebKit support for the VP8 video codec is only available in WebRTC. Video simulcast supports a technique for encoding video content with different parameters such as frame size or bit rate for serving the same content to multiple clients through a central server. Major improvements to WebRTC include support for video simulcast and the VP8 video codec. Payment Request is now the recommended way to pay implement Apple Pay on the web.ДЇor more details, see the Payment Request API specifications. These changes now bring the Payment Request API to parity with the Apple Pay JS payment system, but with all of the benefits of web standards compatibility. The Payment Request API has been updated with granular errors, support for default addresses and contacts configured in Wallet and Apple Pay settings, and special field support for Japan. Read more about these changes in the вЂњ Intelligent Tracking Prevention 2.1вЂќ blog post. Going a step further, Intelligent Tracking Prevention now also limits long-term tracking for JavaScript first-party cookies. To do that, support for partitioned cookies was removed for domains Intelligent Tracking Prevention identifies as having cross-site tracking capabilities. Updates to Intelligent Tracking Prevention add new restrictions to cookies, further reducing the ability of hidden third parties to track users across websites they visit. This helps developers test both color schemes without switching the whole system. Web Inspector has also been improved with a new toggle in the Elements tab to easily switch between the light and dark mode. If youвЂ™re reading this post in Safari 12.1 for macOS Mojave, you can toggle in and out of Dark Mode in System Preferences в†’ General to see that itself provides light and dark color schemes.

Alternatively, light) can be used to provide light styles that override a default dark theme. Web content authors can use the dark) media query to provide dark mode styles that override a default light theme. To help websites better integrate with the dark appearance setting in macOS Mojave, WebKit provides the supported-color-schemes property and prefers-color-scheme media query to allow a webpage to support light and dark color schemes. With usersвЂ™ ability to choose between light and dark color schemes, websites can start to look out of place, or worse, become a blinding and painful experience.

For an up-to-date guide on dark mode in WebKit, including changes for iOS 13 and macOS Catalina, read our Dark Mode Support in WebKit post.

Experimental webkit features on iphone