Exemplos:

<input name="txt" type="text" disabled="true" value="Teste">
<textarea name="memo" cols="" rows="" disabled="disabled"></textarea>
<input name="ck" type="checkbox" disabled="true" value="">
<input name="rb" type="radio" disabled="true" value="">
<select name="list" disabled="disabled"></select>
<input name="" type="button" disabled="true">