The dir property may be set to indicate a left-to-right or right-to-left parsing direction.
This is part of the localization support and represents the contents of the DIR="..." tag attribute.
If you assign a value to this property it is case-sensitive and must be either "ltr" or "rtl". Note that this is at variance with some documentation which says it is case insensitive.
This property works in conjunction with the lang property to control the direction of text flow.