<header>
  <h2 class="title">element.style.borderTopStyle</h2>
  <p class="description">Дозволяє змінювати стиль верхнього кордону елемента.</p>
</header>
<main>
  <div class="result">
    <div id="styledElement" class="box">Тестовий елемент</div>
    <label for="borderStyleSelector">Виберіть стиль верхнього кордону:</label>
    <select id="borderStyleSelector">
      <option value="none">None</option>
      <option value="solid">Solid</option>
      <option value="dotted">Dotted</option>
      <option value="dashed">Dashed</option>
      <option value="double">Double</option>
      <option value="groove">Groove</option>
      <option value="ridge">Ridge</option>
      <option value="inset">Inset</option>
      <option value="outset">Outset</option>
    </select>
  </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 {
  border: 2px solid #333;
  padding: 20px;
  margin-bottom: 15px;
}
document.getElementById('borderStyleSelector').addEventListener('change', function() {
  var selectedStyle = this.value;
  var element = document.getElementById('styledElement');
  element.style.borderTopStyle = selectedStyle;
});

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