MediaWiki:Main Page.js

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mw.loader.using(['mediawiki.util','jquery'], function(util, $) {
  if ( mw.config.get('wgPageName') === 'Main_Page' ) {
    // 1) fetch the rendered template HTML…
    $.get( util.getUrl('MediaWiki:HomepageDraft', { action: 'render' }), function(html) {
      // 2) replace the wiki content with your custom markup
      $('#mw-content-text').html(html);
    });
  }
});