The answer is easy: It uses server-side rendering of the HTML for the edit markup and abstracts the form marshaling ... the powerful trio of HTML, JavaScript, and CSS, which continues to win ...

Back in 2012, Mozilla launched Thimble, an online code editor for teaching the basics of HTML, CSS and JavaScript ... code editors like Brackets and full online IDEs like Nitrous took center ...

jsFiddle is the perfect solution; it provides a custom environment (based on user selections) to test (or fiddle with) your JavaScript, HTML, and CSS code right inside your browser. A quick tour ...