text: const MATRIX_SIZE = 20
  
  
  let matrix = new Array(MATRIX_SIZE);
  let table = document.getElementById('matrix');
  
  for (let index = 0; index < matrix.length; index++) {
    matrix[index] = new Array(MATRIX_SIZE);
    table.innerHTML += '<tr id="row'+ index +'"></tr>';
  }
  
  for (let index = 0; index < matrix.length; index++) {
    for (let i = 0; i < matrix[index].length; i++) {
      document.getElementById('row'+index).innerHTML += '<td id="'+ index + ',' + i +'"></td>'
    }
  }
  
  
  
  
  