xhtml - javascript removeAttribute() doesn't remove "disabled" -

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subject #2: <input type="text" name="subject2" id="sub2" class="i2" size="20" disabled> <br>     <button  onclick="document.getelementbyid('sub2').removeattribute('disabled')"> add subject</button>

this wrote, when press button input field becomes white (becomes useable) second, , returns grey , disabled. did wrong? thank you

js fiddle demo


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