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Comment by aabbcc1241 | Hacker News Reader

Why not inject css instead? That would be more effective

how do you mean?

  var node = document.createElement('style');
  node.innerHTML = '* { outline: 2px dotted orangered; };
  document.body.appendChild(node);

This should suffice, no need to make a variable, this can all be done at once:

   document.head.appendChild(document.createElement('style')).textContent = '* { outline: 2px dotted orangered'