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FCKeditor allows the use of CSS classes for block indentation. The class should be defined in the EditorAreaCSS file:
.Indent1
{
margin-left: 40px;
}
.Indent2
{
margin-left: 80px;
}
.Indent3
{
margin-left: 120px;
}
We apply the class to the IndentClass option:
FCKConfig.IndentClasses = [ 'Indent1', 'Indent2', 'Indent3' ] ;
NOTE: If you use this option the settings of IndentLength and the IndentUnit will be override.