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Joomla has a wide variety of wysiwyg editors. They can help speed up many aspects of coding; such as text color, linking, etc. However, the real power lies in the source code option for which you can troubleshoot and customize the html with div tags, ids, classes, span tags, and even spell checking. Typically, the editors in wysiwyg mode do not spell check.

If you do any substantial editing in Joomla, using the best of both worlds (source code and non-source code) will allow very detailed, quick styling.