[w3c] Is this a real error ?

//--Dear W3C,
     (Sun, 27Fev2022, 00h15 Lisbon) This web page of mine raises one error:
*there is no attribute "oninput"*
/*http://web.tecnico.ulisboa.pt/~mcasquilho/compute/CISTI_2022/P-SuperAPolymer.php*//*
*/    Is it true ?
     Thank you in advance,
Miguel Casquilho (University of Lisbon, Portugal)--//