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Here's a good reference: http://www.w3.org/TR/html401/index/elements.html
To program Javascript, all you need is a text editor to write Javascript. But the difference between a regular editor versus a good one is huge for productivity. NotePad++ is the best free editor for HTML and Javascript, with syntax colouring, code folding. Get it here: http://notepad-plus.sourceforge.net/uk/site.htm.
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Expression Web is the best of all worlds. With code-completion (intellisense) for CSS Styles, and hover mouseover error messages and warnings, it makes all browser-side programming extremely simple. It even highlights mismatched html tags. (Note that Dreamweaver does not have Javascript code-completion.)
User Firefox as your browser, and get the Firebug add-on. Firebug allows you to see the Document Object Model (DOM), showing the relationship of all elements in a page. It also has a full Javascript debugger, allowing you to add breakpoints and single-step F10 through the code and inspect variable values.
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