accesskeyを表示するブックマークレット

javascript:(function(){alert('M-C-[key]');var styleElem=document.head.appendChild(document.createElement('style'));styleElem.innerHTML='a[accesskey]:after,button[accesskey]:after,input[accesskey]:after,label[accesskey]:after,legend[accesskey]:after,textarea[accesskey]:after{margin-left:0.1em; content: "["attr(accesskey)"]";}';})()

javascript:(function(){
  alert('M-C-[key]');
  var styleElem=document.head.appendChild(document.createElement('style'));
  styleElem.innerHTML='a[accesskey]:after,'
    + 'button[accesskey]:after,'
    + 'input[accesskey]:after,'
    + 'label[accesskey]:after,'
    + 'legend[accesskey]:after,'
    + 'textarea[accesskey]:after {'
    + '  margin-left:0.1em;'
    + '  content: "[" attr(accesskey) "]";'
    + '}';
})()

• cf. Make Your Browser Display Any Web Page's Keyboard Shortcuts
• cf. javascript - Change the style of :before and :after pseudo-elements? - Stack Overflow