<header>
  <h2 class="title">element.style.backgroundSize</h2>
  <p class="description">Встановлює або отримує розмір фону елемента.</p>
</header>
<main>
  <div class="result">
    <div id="backgroundElement" class="background-element">
      <p>Фонове зображення</p>
    </div>
    <button onclick="setBackgroundSize('auto')">Auto</button>
    <button onclick="setBackgroundSize('cover')">Cover</button>
    <button onclick="setBackgroundSize('contain')">Contain</button>
    <button onclick="setBackgroundSize('100px 50px')">100px 50px</button>
    <button onclick="setBackgroundSize('50% 50%')">50% 50%</button>
  </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);
}

.background-element {
  width: 300px;
  height: 200px;
  background-image: url('https://via.placeholder.com/300x200');
  background-repeat: no-repeat;
  background-position: center;
  margin-bottom: 15px;
}

button {
  margin: 5px;
  padding: 10px;
  font-size: 14px;
  cursor: pointer;
}

function setBackgroundSize(size) {
  const element = document.getElementById('backgroundElement');
  element.style.backgroundSize = size;
}

External CSS

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External JavaScript

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