Paste HTML supports HTML, CSS, and JavaScript. You can even use Markdown if you want. It's a very simple tool with a very simple purpose, so if you need to play around and don't have a web server ...

For all your HTML monkeys out there: Handy web tool called rendr 2 takes HTML and CSS markup and displays what it would look like live as you type on the page. Similar to the "Edit CSS" option in ...