choosing Edit, Undo (or by pressing Ctrl+Z/Option+Z) are also visible in the History panel. Although you can increase this number, be aware that these steps are stored in memory. The higher you increase this number, the more memory is consumed by your computer. Spelling dictionary: Lists the various dictionaries to use with the spell checker. By default, this option is set to English (American). The Accessibility Category As you can see from Figure 5.2, the Accessibility category of the Preferences window allows you to customize how you work with various accessibility features in Dreamweaver. Figure 5.2. The Accessibility category of the Preferences window allows you to customize how you work with accessibility features in Dreamweaver. [View full size image]   NOTE More information on Accessibility can be found in Appendix A, "Accessibility."   A complete list of customizable functionality is given here: Show attributes when inserting: As you will see in Appendix A, form objects, frames, media elements, and images all carry accessibility attributes that you can set. Checking these boxes guarantees that whenever you insert a form object, create a frame, or insert a media or image element, a dialog appears allowing for customization of accessibility attributes for the respective element. If these check boxes are left unchecked, an accessibility dialog does not automatically appear when you insert the previously mentioned elements onto the page. Again, we'll discuss these options with more detail in Appendix A. Keep focus in the panel when opening: Enable this option if you want to keep the focus in panels when they open; disable this option to keep the focus in the main window when you open a panel. Offscreen Rendering: Disable this option if you ever have issues with a screen reader viewing your pages. The Code Coloring Category One of the subtle benefits to working in the code environment in Dreamweaver is that all code is separated into colors. For instance, most ordinary HTML elements appear as blue, styles as maroon, scripts as red, form elements as orange, literal text as black, and so on. You might want to pursue these colors even further and customize them to your liking. Even better, you might want to create more color combinations for tags. If this is the case, the Code Coloring category in the Preferences window is for you. As you can see from Figure 5.3, the Code Coloring category allows you to customize how elements in a specific tag library are displayed. Figure 5.3. The Code Coloring category allows you to customize the color of elements in various tag libraries. [View full size image]   As you will see, aside from plain HTML, other tag libraries exist and can be modified. A complete list of customizable functionality in the Code Coloring category is given here: Document type: Lists all the document libraries that are supported and that can be customized in Dreamweaver. When you've found the tag library whose colors you'd like to customize, select it, and click the Edit Coloring Scheme button. Edit Coloring Scheme: After you've selected a tag library from the Document Type list box, click this button to display the Edit Coloring Scheme