MediaWiki:Common.js

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

let collapsed = true;
function expand() {
     if (collapsed) {
          document.getElementById("collapsed-head").style.display = "none";
          document.getElementById("expanded-head").style.display = "block";
     }
     else {
          document.getElementById("collapsed-head").style.display = "block";
          document.getElementById("expanded-head").style.display = "none";
     }
}

expand();