10 Best Code playgrounds/Online HTML Editors for developers1. Codepen
CodePen offers the coolest user interface without costing money. It’s a sophisticated playground for the front end side of the web. It’s all about inspiration, education, and sharing. The service highlights popular demonstrations and offers advanced functionality such as sharing and embedding.
CSSDesk is an Online HTML5, CSS3 Sandbox. It allows people to quickly test snippets of CSS code, and watch the result appear live, offers account, cloud saving, pro features, clean interface and code preferences. It does not have lots of fancy features its simplicity gives focus on the things that matter.
Cloud9 IDE lets you code and chat together with your fellow developers, share your workspaces or keep them private. Set up your system without any hassle, Built-In Terminal For command-line wizardry, Language Tools Make writing code a breeze, Debugger, Configure your own UI, themes, run panel, Built-In Image Editor etc it’s the best premium IDE in the world.
5. JS Bin
ShiftEdit is an online IDE that syncs and backs up your code revisions. It supports real-time validation, sophisticated auto-complete, syntax checking, function definitions make programming a breeze All Browsers, Terminal, Customizable snippets, notes, change themes, Connect to your project files wherever they reside (FTP, SFTP, Dropbox, Google Drive, Clone a repository from Github/Bitbucket)
Dabblet is an interactive playground for quickly testing snippets of CSS and HTML code. It uses prefix free, so that you will not have to add any prefixes in your CSS code, save your work in Github, embed it in other websites and share it with others. It currently only supports modern versions of Chrome, Safari and Firefox.
10. The HTML5 Playground
This service includes a library of code snippets you can explore to see HTML5 in action. They include some basic getting-started examples, such as the use of the HTML5 Doctype and the audio tag, including HTML5 elements such as range and date inputs and automated validation for email addresses and websites.
So what you use, which one is your favorite worth mentioning don’t forget to mention :)