The IDE has very good tooling for HTML, CSS, Less, Sass, and JSON, tooling that is based on the same technology that powers the Internet Explorer F12 developer tools.

It is written in HTML, CSS, and JavaScript, which run in a thin native shell, and supports 30-odd languages. Brackets extensions are also written in JavaScript and can call Node.js modules.

The Codelobster free web language editor has been available for quite some time and has attracted many fans. It allows you to edit PHP, HTML, CSS and JavaScript files, and it highlights the syntax and ...

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 ...

Komodo IDE 6 now has full Python 3 support (syntax checking, code intelligence, debugging), updated autocomplete for Perl 5.12 and full autocomplete support for HTML 5, CSS 3.

There is a traditional code editor on the left and you can see the instant preview on the right. The service is clearly meant for novice users who are still trying to get to grips with basic HTML.