User:Admin-shahadat/common.js

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$(document).ready(function() {
  // Hide TOC by default if it's set to hidden
  if ($('#toctogglecheckbox').is(':checked')) {
    $('#toc').addClass('toc-hidden');
  }

  // Toggle TOC visibility on click
  $('#toctogglecheckbox').click(function() {
    $('#toc').toggleClass('toc-hidden');
  });
});