jQuery UI

jQuery UI provides abstractions for low-level interaction and animation, advanced effects and high-level, themeable widgets, built on top of the jQuery JavaScript Library, that you can use to build highly interactive web applications.

jQuery UI is an open-source library of interface components – interactions, full-featured widgets, and animation effects — based on the stellar jQuery javascript library . Each component is built according to jQuery’s event-driven architecture (find something, manipulate it) and is themeable, making it easy for developers of any skill level to integrate and extend into their own code.

Firebug Firefox Add-On

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.

Visit the Firebug website for documentation, screen shots, and discussion forums: http://getfirebug.com

Web Developer Toolbar for Firefox

This is a great add-on for Firefox.

The Web Developer extension adds a menu and a toolbar with various web developer tools.

You can validate your HTML or xHTML markup & CSS code, highlight certain objects, and many more useful functions.

Validate Your Website’s HTML and xHTML Markup!

With the increasing compliance by browser vendors to adhere to (some) of the W3C document and CSS standards, it is ever-increasingly important to use markup (tags), attributes, and coding practices that adhere to these standards as well.

Specifying document type and character encoding and using supported tags and attributes for the version of HTML (4.01) or xHTML (1.0 or 1.1 Transitional or Strict) not only increases the likelihood of your pages rendering properly and bug-free across multiple browsers and operating platforms, but also aide in your website’s ability to be indexed by spiders and crawlers and is the most important step in organic search engine optimization.

Web Design Tutorials & Articles

• http://www.alistapart.com/
• http://w3schools.com/
• http://webdev.entheosweb.com/
• http://www.csszengarden.com/
• http://docs.jquery.com/Tutorials
• http://aneventapart.com/
• http://www.developertutorials.com/
• http://www.goodphptutorials.com/