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 ... with a page divided into various ...

HTML or HyperText Markup Language tells the web browser what each part of a website is, while CSS or Cascading Style Sheets helps give the web pages their look and formatting. Although you’ll ...

These content-containing boxes are standard HTML page elements like divs, paragraphs, headings or ordered lists elements. The margin CSS attribute allows you to designate a distance for all sides ...