Thimble, which is part of Mozilla's recently launched Webmaker project, is meant to help novice users write and edit basic HTML and CSS right in a web-based code editor.

By using Twitter’s bootstrap, we can combine HTML and CSS and decrease the size of the vocabulary. We’ll enable it to generate the markup for a screenshot it has not seen before.

Basic HTML and CSS are key if you want to optimize and test your landing pages. And trust me--you definitely want to be doing those things! Cut down on IT managers.