turn off the bidirectional algorithm for the enclosed text
The BDO element allows authors to turn off the bidirectional algorithm for the enclosed text.
This element is part of the internationalization efforts of HTML4 and is used to resolve problems that might occur when displaying human languages.
Human languages require a certain character order (left-to-right or right-to-left). This ordering can be set on a global scale in a document or Web browser, but there may be local text fragments that must be displayed in a different order.
For example, in the English language (read left-to-right), you might quote a document in a language that is intended to be read from right-to-left.