Code to calculate country-wise death percent for COVID-19 cases at https://www.worldometers.info/coronavirus/

index.js

// Run thro' browser JS console
$('#main_table_countries_today > tbody:nth-child(2) > tr').each(function(item) {
  var total = parseInt($(this).children('td:nth-child(2)').text().replace(/,/g, ''), 10);
  var active = parseInt($(this).children('td:nth-child(7)').text().replace(/,/g, ''), 10);
  var deadCases = parseInt($(this).children('td:nth-child(4)').text().replace(/,/g, ''), 10);
  var recOrDead = total - active;
  $(this).append('<td>' + ((deadCases / recOrDead) * 100).toFixed(3) + '</td>');
});