Hi Arefi,
Thanks for your interest in Essential HTMLUI.
We have an open feature request for the support of bdo tag with dir attribute along with few more tags like center, big, small, dfn, etc in HTMLUI. Please follow the link shown below for the status updates of the feature implementation.
http://www.syncfusion.com/support/features/htmlui/Default.aspx?ToDo=view&questId=605
I will get back to you as soon as the feature has been implemented.
Thanks for your patience.
Regards,
Nanda.