MediaWiki:Common.js

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• Opera: Go to Menu → Settings (Opera → Preferences on a Mac) and then to Privacy & security → Clear browsing data → Cached images and files.

/* Toggle sidebar on mobile */
mw.loader.using('jquery').then(function(){
  $('<button>',{
      id:'hf-ham',
      text:'☰',
      title:'Toggle menu'
    })
    .css({
      fontSize:'1.5rem',
      background:'none',
      border:0,
      color:'#fff',
      cursor:'pointer',
      margin:'0 0 0 .5rem'
    })
    .prependTo('#mw-head, .vector-header-container')  // works in both skins
    .on('click', () => $('body').toggleClass('menu-open'));
});