$HTMLPurifier_Config->set('HTML.AllowedAttributes', "*.style,*.alt,*.title,a.href,a.target,img.src,img.height,img.width,table.align,table.border,table.cellpadding,table.cellspacing");
$HTMLPurifier_Config->set('HTML.AllowedElements','h1,h2,h3,h4,h5,h6,a,p,ol,li,ul,dl,dt,dd,b,br,span,img,pre,blockquote,div,table,thead,tbody,tfoot,th,tr,td');

위 코드를 아래 코드로 바꿔보세요.

$HTMLPurifier_Config->set('HTML.AllowedAttributes', "*.style,*.alt,*.title,*.id,*.name,*.classid,*.usemap,*.type,a.href,a.target,src,height,width,table.align,table.border,table.cellpadding,table.cellspacing,frameborder");
$HTMLPurifier_Config->set('HTML.AllowedElements','h1,h2,h3,h4,h5,h6,a,p,ol,li,ul,dl,dt,dd,b,br,span,img,pre,blockquote,div,table,thead,tbody,tfoot,th,tr,td,iframe,object,embed');

새로운 태그와 속성을 더 추가하시면 사용 가능합니다.