nl_tokens: Generates a preview for a format
pl_tokens: function getPreviewCss ( ed , fmt ) { var name , previewElm , dom = ed . dom , previewCss = '' , parentFontSize , previewStylesName ; previewStyles = ed . settings . preview_styles ; // No preview forced
   if ( previewStyles === false ) return '' ; // Default preview
   if ( ! previewStyles ) previewStyles = 'font-family font-size font-weight text-decoration text-transform color background-color' ; // Removes any variables since these can't be previewed
   function removeVars ( val ) { return val . replace ( / %(\w+) / g , '' ) ; } ; // Create block/inline element to use for preview
   name = fmt . block || fmt . inline || 'span' ; previewElm = dom . create ( name ) ; // Add format styles to preview element
   each ( fmt . styles , function ( value , name ) { value = removeVars ( value ) ; if ( value ) dom . setStyle ( previewElm , name , value ) ; } ) ; // Add attributes to preview element
   each ( fmt . attributes , function ( value , name ) { value = removeVars ( value ) ; if ( value ) dom . setAttrib ( previewElm , name , value ) ; } ) ; // Add classes to preview element
   each ( fmt . classes , function ( value ) { value = removeVars ( value ) ; if ( ! dom . hasClass ( previewElm , value ) ) dom . addClass ( previewElm , value ) ; } ) ; // Add the previewElm outside the visual area
   dom . setStyles ( previewElm , { position : 'absolute' , left : - 0xFFFF } ) ; ed . getBody ( ) . appendChild ( previewElm ) ; // Get parent container font size so we can compute px values out of em/% for older IE:s
   parentFontSize = dom . getStyle ( ed . getBody ( ) , 'fontSize' , true ) ; parentFontSize = / px$ / . test ( parentFontSize ) ? parseInt ( parentFontSize , 10 ) : 0 ; each ( previewStyles . split ( ' ' ) , function ( name ) { var value = dom . getStyle ( previewElm , <mask> , true ) ; // If background is transparent then check if the body has a background color we can use
   if ( name == 'background-color' && / transparent|rgba\s*\([^)]+,\s*0\) / . test ( value ) ) { value = dom . getStyle ( ed . getBody ( ) , name , true ) ; // Ignore white since it's the default color, not the nicest fix
   if ( dom . toHex ( value ) . toLowerCase ( ) == '#ffffff' ) { return ; } } // Old IE won't calculate the font size so we need to do that manually
   if ( name == 'font-size' ) { if ( / em|%$ / . test ( value ) ) { if ( parentFontSize === 0 ) { return ; } // Convert font size from em/% to px
   value = parseFloat ( value , 10 ) / ( / %$ / . test ( value ) ? 100 : 1 ) ; value = ( value * parentFontSize ) + 'px' ; } } previewCss += name + ':' + value + ';' ; } ) ; dom . remove ( previewElm ) ; return previewCss ; }