document.open();
document.write('<ul id="fsize">');
document.write('<li class="sizeS" id="small"><span>小</span></li>');
document.write('<li class="sizeM" id="medium"><span>中</span></li>');
document.write('<li class="sizeL"  id="large"><span>大</span></li>');
document.write('<li id="sFttl">文字の大きさ</li></ul>');
document.close();