Safari Technology Preview Release 112 is now available for download for macOS Big Sur and macOS Catalina.

Release Notes for Safari Technology Preview 111

Safari Technology Preview Release 111 is now available for download for macOS Big Sur and macOS Catalina.

Speculation in JavaScriptCore

This post is all about speculative compilation, or just speculation for short, in the context of the JavaScriptCore virtual machine.

Safari Technology Preview Release 110 is now available for download for macOS Big Sur and macOS Catalina.

App-Bound Domains

Many applications use WKWebView as a convenient way to display websites without requiring users to leave the app, referred to as in-app browsing.

Safari Technology Preview Release 109 is now available for download for macOS Catalina.

Safari 13.1 adds support for the async Clipboard API.

Safari Technology Preview Release 108 is now available for download for macOS Catalina and macOS Mojave.

Safari Technology Preview Release 107 is now available for download for macOS Catalina and macOS Mojave.

Safari Technology Preview Release 106 is now available for download for macOS Catalina and macOS Mojave.

Safari Technology Preview Release 105 is now available for download for macOS Catalina and macOS Mojave.

If you search for any JavaScript performance advice, a very popular recommendation is to avoid the delete operator.