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If one only needs a scratch pad, localStorage works. Just save this to a file and load the file into Chrome:

  <html contenteditable="true"><body></body></html>
  <script>
      const a=localStorage.getItem('saved-text-data');
      document.querySelector('body').innerHTML=a;
      setInterval(()=>{localStorage.setItem('saved-text-data', document.querySelector('body').innerHTML);}, 2000);
  </script>
I just about considered buying a short domain and putting this code up on there
This is the winner. Opening a new tab is the lightest weight action. Thanks for suggesting it!