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@ToDo: Set this up on CAS and DM3105

specifically designed to help JavaScript and CSS folk test snippets of code, within some context, and debug the code collaboratively. JS Bin allows you to edit and test JavaScript and HTML (reloading the URL also maintains the state of your code - new tabs doesn't). Once you're happy you can save, and send the URL to a peer for review or help. They can then make further changes saving anew if required.

Edit, test, visualice HTML5, CSS & JS on-line in a sandbox Editar,probar, visualizar HTML5, CSS & JS on-line en un arenero

This is a complete tutorial to using LESS with Chrome's DevTools. If you've used Sass with Chrome's DevTools, you'll most likely already be familiar with the concepts introduced here. | Difficulty: Beginner; Length: Quick; Tags: Tools & Tips, Tutorials, Web Dev

Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page.

I use the following bit of CSS to help visualize the structure of an XHTML (or HTML) document by putting a colored outline around the border of every element. At each level in the hierarchy the color changes so you can see when "depth" changes.   * { outline: 2px dotted red }   * * { outline: 2px dotted green }   * * * { outline: 2px dotted orange }   * * * * { outline: 2px dotted blue }   * * * * * { outline: 1px solid red }   * * * * * * { outline: 1px solid green }   * * * * * * * { outline: 1px solid orange }   * * * * * * * * { outline: 1px solid blue }