I&#x27;m not sure what distinction you&#x27;re making between Dart and languages that &quot;compile in the browser&quot;. You linked to Jeremy Ashkenas&#x27; list of languages which compile to Javascript, yet that list includes Java, Python, and even Dart<p>Edit: Are you referring to languages that you can compile to Javascript by including a script in the HTML? I remember doing this with React, before I set up a build tool to my project. If that&#x27;s what you&#x27;re referring to, I&#x27;m not sure it&#x27;s such a huge factor. For one thing, I am not aware of any technical reasons why Dart can&#x27;t do this as well. For another thing, I don&#x27;t think compiling in the browser is all that popular. Most front-end developers have embraced build tools like Gulp, Grunt, and Webpack which allow compile to Javascript. Compiling in the browser is also not as performant.