MediaWiki:Common.js

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

function pgTestFunction() {
  var xmlHttp = new XMLHttpRequest();
  xmlHttp.open( "GET", "https://de.wikipedia.org/api/rest_v1/page/summary/Albert_Einstein", false ); // false for synchronous request

  xmlHttp.send( null );

  alert(xmlHttp.responseText);
}