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The CSS subtab contains the CSS files that Oxygen XML Editor uses to render a document in the Author mode. In this subtab, you can set main and alternate CSS files. When you are editing a document in the Author mode, you can switch between these CSS files from the Styles drop-down menu on the Author Styles toolbar.

To open the CSS subtab, open the Preferences dialog box (Options > Preferences), go to Document Type Association, use the New, Edit, Duplicate, or Extend button, click on the Author tab, and then the CSS subtab.

The following actions are available in the CSS subtab:
New
Opens a dialog box that allows you to add a CSS file. You can specify the path by using the text field, its history drop-down, the Insert Editor Variables button, or the browsing tools in the Browse drop-down list.
Edit
Opens a dialog box that allows you to edit the current selection.
Delete
Deletes the currently selected CSS file.
Move Up
Moves the selected CSS file up in the list.
Move Down
Moves the selected CSS file down in the list.
Enable multiple selection of alternate CSSs
Allows users to apply multiple alternate styles, as layers, over the main CSS style. This option is selected by default for DITA document types.
If there are CSSs specified in the document then
You can choose between the following options for controlling how the CSS files that are set in this subtab will be handled if a CSS is specified in the document itself:
  • Ignore CSSs from the associated document type - The CSS files set in this CSS subtab are overwritten by the CSS files specified in the document itself.
  • Merge them with CSSs from the associated document type - The CSS files set in this CSS subtab are merged with the CSS files specified in the document itself.