<html><body><span>글자수:</span><span id="n">0</span><br/><textarea id="t" onkeyup="document.getElementById('n').innerHTML=document.getElementById('t').value.length;"></textarea><br/><textarea id="w" placeholder="폭(픽셀)" onkeyup="document.getElementById('t').style.width=document.getElementById('w').value+'px';"></textarea><textarea id="h" placeholder="높이(픽셀)" onkeyup="document.getElementById('t').style.height=document.getElementById('h').value+'px';"></textarea></body></html>
