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Aptana Studio supports syntax highlighting for the array of languages mentioned above. This helps root out elementary errors such as typos. In addition to syntax highlighting, Aptana Studio supports a code assist feature for HTML, CSS and Javascript. What this does is it visually shows your what elements are compatible with whichever web browsers you are targeting.
There is support for internal Javascript debugging with integration to Firefox and Internet Explorer. Not only does Aptana Studio provides debugging for Javascript. It also provides libraries for several Javascript and Ajax Frameworks such as JQuery, Sencha formerly known as Ext JS, Prototype, Scriptaculous and others which help to increase productivity of your projects.
Aptana Studio provides a DOM outline of your HTML code. This breaks down you code into the tag sections and this is great for checking out the element hierarchy of your HTML documents.
You can choose to use Aptana Studio to directly access your server through FTP. If you prefer to work off a shared repository, Aptana studio offers support for subversion, Git, bazaar and other code sharing and collaboration services.
Anytime as you work you can always check out a live preview of your work by using the tabs at the bottom of the editor and see how your work looks in different browsers.