MediaWiki:Gadget-customeditbuttons.js

Note: After saving, you have to bypass your browser's cache to see the changes. Internet Explorer: hold down the Ctrl key and click the Refresh or Reload button. Firefox: hold down the Shift key while clicking Reload (or press Ctrl-Shift-R). Google Chrome and Safari users can just click the Reload button. For details and instructions about other browsers, see Wikipedia:Bypass your cache.

mwCustomEditButtons[ mwCustomEditButtons.length ] = {
     "imageFile":
"//upload.wikimedia.org/wikipedia/commons/b/ba/Button_clipboard_category.gif",
     "speedTip": "Test",
     "tagOpen": "{{Foo|",
     "tagClose": "|Bar}}",
     "sampleText": 'Baz...'
};