snippet.html

<input type="text" name="country" value="Norway" readonly>

readonly 속성을 추가한다.

snippet.html

<input type="text" name="fname"><br>
<input type="text" name="lname" disabled><br>

snippet.html

<select disabled>
  <option value="volvo">Volvo</option>
  <option value="saab">Saab</option>
  <option value="mercedes">Mercedes</option>
  <option value="audi">Audi</option>
</select>

태그 속성안에 disabled를 삽입한다.