Re: Patch for "HTML5" support

* Bjoern Hoehrmann wrote:
>If there is enough interest in this that we get some test reports to the
>[email protected] mailing list, and people can't find major
>bugs, I might polish the patch and commit it.

http://lists.w3.org/Archives/Public/www-archive/2011Nov/0007.html has a
bit more polished version, I sorted some table entries, this should deal
with data-* attributes, and I made the tidyAttrIsProp changes I noted. I
also note that none of the "HTML5" named character references are added.
I am unsure how the logic for those should work, four problems:

  * It is unclear to me that this new feature has been properly tested
    in the real world, supporting all the new ones may break things.

  * There are now "foo" and "foo;" entities to accomodate the "missing
    semicolon" problem to some degree. Tidy could do the same simply by
    keeping the semicolon around with an appropriately changed table

  * Some entities apparently resolve the multiple characters now. That
    is a bit of a problem as it makes generating the entities from the
    characters a good bit harder; also, this would require changes to
    the data tables, would probably have to write { 0xABCD, 0x0000 } or
    some such for lack of Unicode escape support in old compilers.

  * Some of these entities are fairly new. When should Tidy generate
    the new ones? Should there be an option to control this?

Generally, I would probably put support for them on the "someday, maybe"
pile along with inline SVG and MathML support, when there is evidence of
these features being supported (by, say, all major search engines, where
such support matters).
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