<header>
  <h2 class="title">DOMTokenList: item() method</h2>
  <p class="description">Повертає елемент DOMTokenList за заданим індексом.</p>
</header>
<main>
  <div class="result">
    <div>
      <label for="classInput">Введіть клас:</label>
      <input type="text" id="classInput">
      <button id="addClassBtn">Додати клас</button>
    </div>
    <div>
      <label for="indexInput">Введіть індекс:</label>
      <input type="number" id="indexInput" min="0">
      <button id="getClassBtn">Отримати клас</button>
      <span id="classOutput"></span>
    </div>
    <div id="demoDiv" class="demo"></div>
  </div>
</main>
body {
  font-size: 16px;
  line-height: 1.5;
  font-family: monospace;
}

header {
  background-color: #f1f1f1;
  margin-bottom: 25px;
  padding: 15px;
  -webkit-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  -moz-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
}

header h2.title {
  padding-bottom: 15px;
  border-bottom: 1px solid #999;
}

header p.description {
  font-style: italic;
  color: #222;
}

.result {
  background-color: #f8f8f8;
  padding: 15px;
  -webkit-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  -moz-box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
  box-shadow: 0px 0px 3px 0px rgba(118, 118, 118, 1);
}

.demo {
  margin-top: 20px;
  padding: 10px;
  background-color: #eee;
}
const classInput = document.getElementById('classInput');
const addClassBtn = document.getElementById('addClassBtn');
const indexInput = document.getElementById('indexInput');
const getClassBtn = document.getElementById('getClassBtn');
const classOutput = document.getElementById('classOutput');
const demoDiv = document.getElementById('demoDiv');

addClassBtn.addEventListener('click', () => {
  const className = classInput.value.trim();
  if (className) {
    demoDiv.classList.add(className);
    classInput.value = '';
  }
});

getClassBtn.addEventListener('click', () => {
  const index = indexInput.value;
  const className = demoDiv.classList.item(index);
  classOutput.textContent = className || 'Клас не знайдено';
});

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External JavaScript

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