MediaWiki:Common.js

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

$(document).ready(function () {
  var body = document.getElementsByTagName("body")[0];
  var callback = function(mutList, _obs) {
    var mut = mutList[0];
    var mutNode = mut.addedNodes;
    if (mutNode.length !== 0 && mutNode[0].classList.contains("mwe-popups")) {
      var eleLeft = mutNode[0].style.left;
      var marginLeft = window.getComputedStyle(body).getPropertyValue("margin-left");
      // subtract the left margin from the computed value
      mutNode[0].style.left = "calc("+ eleLeft + " - "+ marginLeft + ")";
    }
  };
  var observer = new MutationObserver(callback);
  observer.observe(body, { childList: true });
});