To show off what EdgeHTML can do, Microsoft has built a browser using predominantly JavaScript, HTML, and CSS. Next, the company released the app on the Windows Store and the sample code on GitHub.

The new release brings improvements to JavaScript heap profiles, CSS code formatting, and local history. Visual Studio Code 1.66 became available on March 30.

As an app, you can just drop a URL into it and View Source shows you the code behind it. More useful is the new Safari extension.

Back in 2012, Mozilla launched Thimble, an online code editor for teaching the basics of HTML, CSS and JavaScript. Over time, though, things got pretty quiet around the project as other browser ...