MediaWiki:Common.js

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/* Any JavaScript here will be loaded for all users on every page load. */
var toggleStatus = 'no';

function toggleView() {
  if (toggleStatus == 'no') {
    document.getElementById('slider').classList.add("slider-alt");
    toggleStatus = 'yes';
  } else {
    document.getElementById('slider').classList.remove("slider-alt");
    toggleStatus = 'no';
  }
}