[CSS21] Bidi on inline-blocks and inline-tables

CSS2.1 9.10 http://www.w3.org/TR/CSS21/visuren.html#direction

   # In this process, non-textual entities such as images are treated as neutral
   # characters, unless their 'unicode-bidi' property has a value other than
   # 'normal', in which case they are treated as strong characters in the
   # 'direction' specified for the element.

This makes sense for inline replaced elements (and should say "inline
replaced elements" instead of "non-textual entities"), given the way they
will behave if the replaced content fails to load and alternate text is
shown inline instead.

But inline-blocks and inline-tables are not handled in this sentence.
I think they should be treated as neutral always.

   http://fantasai.inkedblade.net/style/tests/issues/bidi-atomic-inlines

~fantasai