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HTML 

              
                <html>

<head>
  <title>
    Imersão Dev - Tabela de classificação
  </title>
</head>

<body>
  <h1>Tabela de classificação</h1>

  <table style="width:100%">
    <thead>
      <tr>
        <th>Nome</th>
        <th>Vitórias</th>
        <th>Empates</th>
        <th>Derrotas</th>
        <th>Pontos</th>
      </tr>
      <input type="text" id="nomeNovoJogador" name="nomeNovoJogador" placeholder="Nome do novo jogador">
      <button onClick="adicionarJogador()">Adicionar Jogador</button>
      <br><br>
    </thead>
    <tbody id="tabelaJogadores">
    </tbody>
  </table>
  <div class="indice">
    <p> Vitória = 3 pontos;
      Empate = 1 ponto;
    </p>
</body>

</html>
!

CSS 

              
                * {
  text-align: center;
}

body {
  font-family: "Roboto Mono", monospace;
  min-height: 400px;
  background-image: url("https://content.betsul.com/media/campeonato-brasileiro-pontuacao-campeao-betsul1sl.jpg");
  background-color: #111;
  background-size: 100%;
  background-position: center;
  background-repeat: no-repeat;
}

.container {
  text-align: center;
  padding: 20px;
  height: 100vh;
}

.page-title {
  color: #ffffff;
  margin: 0 0 5px;
}

.page-subtitle {
  color: #ffffff;
  margin-top: 5px;
}

.page-logo {
  width: 200px;
}

.alura-logo {
  width: 40px;
  position: absolute;
  top: 10px;
  right: 10px;
}

table {
  font-family: "Roboto Mono", monospace;
  border: 2px solid white;
  border-collapse: collapse;
  background: black;
  opacity: 0.8;
  border-radius: 12px;
}

h1 {
  color: white;
  background: black;
  opacity: 0.8;
  border-radius: 12px;
}

th,
tr,
td {
  font-family: "Roboto Mono", monospace;
  border: solid 1px white;
  color: white;
  border-radius: 12px;
}

.indice {
  color: white;
  background: black;
  opacity: 0.8;
  border-radius: 12px;
}

button,
input {
  font-family: "Roboto Mono", monospace;
}
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JS 

              
                // Jogadores de exemplo
var jogador1 = {
  nome: "Jogador1",
  vitorias: 3,
  empates: 1,
  derrotas: 1,
  pontos: 0
};
var jogador2 = {
  nome: "Jogador2",
  vitorias: 0,
  empates: 2,
  derrotas: 3,
  pontos: 0
};
var jogador3 = {
  nome: "Jogador3",
  vitorias: 1,
  empates: 2,
  derrotas: 2,
  pontos: 0
};

// Calculo de pontos por jogador
function calculaPontos(jogador) {
  var pontos = jogador.vitorias * 3 + jogador.empates;
  return pontos;
}

jogador1.pontos = calculaPontos(jogador1);
jogador2.pontos = calculaPontos(jogador2);
jogador3.pontos = calculaPontos(jogador3);

// lista de jogadores exemplo
var jogadores = [jogador1, jogador2, jogador3];

// exibir na tela
function exibeJogadoresnaTela(jogadores) {
  var elemento = "";
  for (var i = 0; i < jogadores.length; i++) {
    elemento += "<tr><td>" + jogadores[i].nome + "</td>";
    elemento += "<td>" + jogadores[i].vitorias + "</td>";
    elemento += "<td>" + jogadores[i].empates + "</td>";
    elemento += "<td>" + jogadores[i].derrotas + "</td>";
    elemento += "<td>" + jogadores[i].pontos + "</td>";
    elemento +=
      "<td><button onClick='adicionarVitoria(" + i + ")'>Vitória</button></td>";
    elemento +=
      "<td><button onClick='adicionarEmpate(" + i + ")'>Empate</button></td>";
    elemento +=
      "<td><button onClick='adicionarDerrota(" + i + ")'>Derrota</button></td>";
    elemento +=
      "<td><button onClick='zerarJogador(" + i + ")'>Zerar</button></td>";
    elemento +=
      "<td><button onClick='removerJogador(" + i + ")'>Remover</button></td>";
    elemento += "</tr>";
  }

  var tabelaJogadores = document.getElementById("tabelaJogadores");
  tabelaJogadores.innerHTML = elemento;
}

exibeJogadoresnaTela(jogadores);

// botões
function adicionarVitoria(i) {
  var jogador = jogadores[i];
  jogador.vitorias++;
  jogador.pontos = calculaPontos(jogador);
  exibeJogadoresnaTela(jogadores);
}

function adicionarEmpate(i) {
  var jogador = jogadores[i];
  jogador.empates++;
  jogador.pontos = calculaPontos(jogador);
  exibeJogadoresnaTela(jogadores);
}

function adicionarDerrota(i) {
  var jogador = jogadores[i];
  jogador.derrotas++;
  exibeJogadoresnaTela(jogadores);
}

function zerarJogador(i) {
  var jogador = jogadores[i];
  jogador.derrotas = 0;
  jogador.empates = 0;
  jogador.vitorias = 0;
  jogador.pontos = 0;
  exibeJogadoresnaTela(jogadores);
}

function adicionarJogador() {
  var nomeNovoJogador = document.getElementById("nomeNovoJogador").value;
  console.log(nomeNovoJogador);
  var novoJogador = {
    nome: nomeNovoJogador,
    vitorias: 0,
    empates: 0,
    derrotas: 0,
    pontos: 0
  };
  var addJogador = jogadores.push(novoJogador);
  exibeJogadoresnaTela(jogadores);
  document.getElementById("nomeNovoJogador").value = "";
}

function removerJogador(i) {
  var jogador = jogadores[i];
  var removeJogador = jogadores.pop();
  exibeJogadoresnaTela(jogadores);
}
!
999px

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