Usor:IacobusAmor/monobook.js

E Vicipaedia

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 if (mwCustomEditButtons) {
   mwCustomEditButtons[mwCustomEditButtons.length] = {
     "imageFile": "http://upload.wikimedia.org/wikipedia/commons/6/64/Button_nbsp_bold.png",
     "speedTip": "non-breaking space",
     "tagOpen": ' ',
     "tagClose": "",
     "sampleText": ""};
   
   mwCustomEditButtons[mwCustomEditButtons.length] = {
     "imageFile": "http://upload.wikimedia.org/wikipedia/commons/b/bf/Button_thinsp.png",
     "speedTip": "thin space",
     "tagOpen": ' ',
     "tagClose": "",
     "sampleText": ""};
 }