length; } function is_default() { return false; } function LineHeight_Absolute($value) { $this->length = $value; } function units2pt($base) { $this->length = units2pt($this->length, $base); } function ©() { $value =& new LineHeight_Absolute($this->length); return $value; } } class LineHeight_Relative extends CSSValue { var $fraction; function apply($value) { return $this->fraction * $value; } function is_default() { return $this->fraction == 1.1; } function LineHeight_Relative($value) { $this->fraction = $value; } function units2pt($base) { } function ©() { $value =& new LineHeight_Relative($this->fraction); return $value; } } ?>