Edit the code and the chart re-runs. It is a docs example: a default export that draws into el and returns its clean-up. Import @chart-on/core, @chart-on/ui, @chart-on/indicators, @chart-on/ta and ./sample-data. The address always holds the code, so a copied link reproduces it.
Runs as you type. Ctrl+Enter or Cmd+Enter runs now. The buttons above rewrite the code; Undo brings your edits back. Tab indents; press Escape, then Tab, to leave the editor.
No errors.