> 
> 
> > So, adding in the header:
> > <META http-equiv="Content-Language" CONTENT="he,ar,en-US">
> 
> This seems unlikely to be a valid use of this simulation of an HTTP
> header as it is unlikely that many documents will be authored in a way

Apologies, I confused Arabic with Aramaic because of my other example.

However, I would argue that most documents, for which this was a
valid HTTP header, would have paragraphs, or at least lines, of
solid Arabic text, so the inclusion of the lang attribute would not
be that difficult.  A Hebrew document that has Cairo in Arabic script
is a pure Hebrew document for HTTP header purposes.

The only case I can think of that would have small fragments would
be appropriate for SVG, not HTML (labelling a diagram).