Hello,

 

HTML defines the dir attribute for text direction with 3 possible values: "ltr" (left-to-right), "rtl" (right-to-left), and "auto" (according to first encountered character). Please have a look at https://www.w3.org/International/questions/qa-html-dir

 

It is, at least, useful for inputs, outputs and labels.

 

As for any HTML attribute, allowing html:dir might be good enough for XForms specifications. Mentioning it explicitly, as already for html:autocomplete, could be a good idea because of its pertinence.

 

For XForms embedded in XHTML, setting dir="auto" by default for all possible XForms elements could also be implementation dependent.

 

--Alain