The name of the BDO element stands for bidirectional override. The LANG and DIR attributes of most elements are designed to take care of most situations involving the mixture of writing systems that compose text in opposite directions. The BDO element is designed to assist in instances when due to various conversions during text processing, the normal bidirectional algorithms must be explicitly overridden. Because this element is not yet implemented in browsers, it is detailed here for informational purposes only.