Escape key handler doesn’t work after one key press

[simevidas]

  document.addEventListener('keyup',e=>{
    if(e.key==='Escape'){
      document.designMode='off';
      s.remove();
    }
  },{once:true});

The handler will run only once, whether Escape was pressed or not, which means that it will stop working after the first key press. Instead of {once:true}, I guess you want to removeEventListener inside the if block.