Module:Su

 -- This module implements {{su}}.

 localp={}

 functionp.main(frame)
 -- Use arguments from the parent frame only, and remove any blank arguments.
 -- We don't need to trim whitespace from any arguments, as this module only
 -- uses named arguments, and whitespace is trimmed from them automatically. 
 localorigArgs=frame:getParent().args
 localargs={}
 fork,vinpairs(origArgs)do
 ifv~=''then
 args[k]=v
 end
 end

 -- Define the variables to pass to luaMain.
 localsup=args.p
 localsub=args.b
 localoptions={
 align=args.a,
 fontSize=args.w,
 lineHeight=args.lh,
 verticalAlign=args.va
 }
 returnp._main(sup,sub,options)
 end

 functionp.invoke_main(frame)
 -- entry point for invocation using frame arguments

 localorigArgs=frame.args
 localargs={}
 fork,vinpairs(origArgs)do
 ifv~=''then
 args[k]=v
 end
 end

 -- Define the variables to pass to luaMain.
 localsup=args.p
 localsub=args.b
 localoptions={
 align=args.a,
 fontSize=args.w,
 lineHeight=args.lh,
 verticalAlign=args.va
 }
 returnp._main(sup,sub,options)
 end

 functionp._main(sup,sub,options)
 options=optionsor{}
 localspan=mw.html.create('span')

 -- Set the styles.
 span:css{
 ['display']='inline-block',
 ['margin-bottom']='-0.3em',
 ['vertical-align']=options.verticalAlignorsuband'-0.4em'or'0.8em',
 ['line-height']=options.lineHeightor'1.2em'
 }
 ifoptions.fontSize=='f'oroptions.fontSize=='fixed'then
 span:css{
 ['font-family']='monospace',
 ['font-size']='80%'
 }
 else
 span:css('font-size',options.fontSizeor'80%')
 end
 ifoptions.align=='r'oroptions.align=='right'then
 span:css('text-align','right')
 elseifoptions.align=='c'oroptions.align=='center'then
 span:css('text-align','center')
 else
 span:css('text-align','left')
 end

 -- Add the wikitext.
 span
 :tag('sup')
 :css('font-size','inherit')
 :css('line-height','inherit')
 :css('vertical-align','baseline')
 :wikitext(sup)
 :done()
 :tag('br',{selfClosing=true}):done()
 :tag('sub')
 :css('font-size','inherit')
 :css('line-height','inherit')
 :css('vertical-align','baseline')
 :wikitext(sub)

 return'<span class="nowrap">'..tostring(span)..'</span>'
 end

 returnp