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Dart 2: Google's Language Rebooted For Web and Mobile Developers (infoworld.com)
An anonymous reader quotes InfoWorld:
Google's Dart language, once positioned a potential replacement for JavaScript in the browser, is being rebooted for client-side web and mobile development in Version 2 of the language. A beta version is now available. Dart 2 features a strengthened type system, a cleaned-up syntax, and a rebuilt developer tool chain.
Dart has a succinct syntax and can run on a VM with a just-in-time compiler, with the compiler enabling stateful, hot reload during mobile development. Developers also gain from fast development cycles where code can be edited, compiled, and replaced in apps running on a device. Compiling code ahead of time provides fast startup, Google said. Dart can be compiled to native code for ARM and x86 platforms. Google has used the language to build applications for iOS, Android, and the web.
Dart has a succinct syntax and can run on a VM with a just-in-time compiler, with the compiler enabling stateful, hot reload during mobile development. Developers also gain from fast development cycles where code can be edited, compiled, and replaced in apps running on a device. Compiling code ahead of time provides fast startup, Google said. Dart can be compiled to native code for ARM and x86 platforms. Google has used the language to build applications for iOS, Android, and the web.
I disagree with your premise that JavaScript is "implemented fully across all known browsers," as it's effectively a living standard where browser vendors implement the parts they can be bothered to.
As Dart for now is still transcompiled to JavaScript, it's realistically more of a competitor to the likes of TypeScript and CoffeeScript. With Dart 2 switching to a mostly mandatory type I hope it catches on this time, as I remember it being a lot of fun to code in.