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 ...

If you're trying to create a post within WordPress that uses HTML and/or CSS formatting, the post editor may strip formatting or add unnecessary paragraphs that break your code.

jsFiddle lets developers play with the three core elements of Web development. Check out this powerful application for rapid prototyping and testing.