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Showing content from http://developer.mozilla.org/ko/docs/Web/HTML/Reference/Elements/optgroup below:

<optgroup> - HTML: Hypertext Markup Language

Baseline Widely available *

HTML <optgroup> ììë <select> ììì ìµìì ë¬¶ì ì ììµëë¤.

<label for="dino-select">Choose a dinosaur:</label>
<select id="dino-select">
  <optgroup label="Theropods">
    <option>Tyrannosaurus</option>
    <option>Velociraptor</option>
    <option>Deinonychus</option>
  </optgroup>
  <optgroup label="Sauropods">
    <option>Diplodocus</option>
    <option>Saltasaurus</option>
    <option>Apatosaurus</option>
  </optgroup>
</select>

label {
  display: block;
  margin-bottom: 10px;
}

ì½íì¸ ì¹´íê³ ë¦¬ ìì. ê°ë¥í ì½íì¸ 0ê° ì´ìì <option> ìì. íê·¸ ìëµ ì¬ë íê·¸ë íììëë¤. ë°ë¡ ë¤ë°ë¥´ë ììê° ë¤ë¥¸ <optgroup>ì´ê±°ë, ìì ì´ ë¶ëª¨ì ë§ì§ë§ ììì´ë¼ë©´ ë«ë íê·¸ë¥¼ ìëµí ì ììµëë¤. ê°ë¥í ë¶ëª¨ ìì <select> ìì. ê°ë¥í ARIA ìí ìì DOM ì¸í°íì´ì¤ HTMLOptGroupElement

ì°¸ê³ : <optgroup> ììë ì¤ì²©í ì ììµëë¤.

í¹ì±

ì´ ììë ì ì í¹ì±ì í¬í¨í©ëë¤.

disabled: ì§ì í ê²½ì° ëª¨ë íì ìµìì ì íí ì ììµëë¤. ë¸ë¼ì°ì ìì, ë¹íì±í ìµìì ì£¼ë¡ íìì¼ë¡ ë³´ì´ë©°, í´ë¦ê³¼ í¬ì»¤ì¤ ë± ëª¨ë ì´ë²¤í¸ë¥¼ ë°ì§ ììµëë¤.

ìì

<select>
  <optgroup label="Group 1">
    <option>Option 1.1</option>
  </optgroup>
  <optgroup label="Group 2">
    <option>Option 2.1</option>
    <option>Option 2.2</option>
  </optgroup>
  <optgroup label="Group 3" disabled>
    <option>Option 3.1</option>
    <option>Option 3.2</option>
    <option>Option 3.3</option>
  </optgroup>
</select>

ê²°ê³¼ ëªì¸ ë¸ë¼ì°ì í¸íì±

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