<header>
  <h2 class="title">element.style.animationTimingFunction</h2>
  <p class="description">Встановлює або повертає функцію тайминґу анімації для елемента.</p>
</header>
<main>
  <div class="result">
    <div class="box"></div>
    <div class="controls">
      <button id="startAnimation">Запустити анімацію</button>
      <select id="timingFunctionSelect">
        <option value="linear">linear</option>
        <option value="ease">ease</option>
        <option value="ease-in">ease-in</option>
        <option value="ease-out">ease-out</option>
        <option value="ease-in-out">ease-in-out</option>
        <option value="cubic-bezier(0.68, -0.55, 0.27, 1.55)">cubic-bezier</option>
      </select>
    </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);
}

.box {
  width: 100px;
  height: 100px;
  background-color: #333;
  animation-duration: 2s;
  animation-name: slideAnimation;
  animation-iteration-count: infinite;
  animation-direction: alternate;
}

@keyframes slideAnimation {
  from { transform: translateX(0); }
  to { transform: translateX(300px); }
}
const box = document.querySelector('.box');
const startButton = document.getElementById('startAnimation');
const timingFunctionSelect = document.getElementById('timingFunctionSelect');

startButton.addEventListener('click', () => {
  const selectedTimingFunction = timingFunctionSelect.value;
  box.style.animationTimingFunction = selectedTimingFunction;
});

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