MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */

/* hide heading on [[Main_Page]] */
   var mpTitle = "Main Page";
   var isMainPage = (document.title.substr(0, document.title.lastIndexOf(" - ")) == mpTitle);
   var isDiff = (document.location.search && (document.location.search.indexOf("diff=") != -1 || document.location.search.indexOf("oldid=") != -1));

  if (isMainPage && !isDiff) {
      document.write('<style type="text/css">/*<![CDATA[*/ #lastmod, #siteSub, #contentSub, h1.firstHeading { display: none !important; } /*]]>*/</style>');
   }

 if (mwCustomEditButtons) {
 
   mwCustomEditButtons[mwCustomEditButtons.length] = {
     "imageFile": ":Image:Button_comment.png",
     "speedTip": "Comment visible only for editors",
     "tagOpen": "<!-- ",
     "tagClose": " -->",
     "sampleText": "Insert comment here"}
  }