[tex4ht] [bug #477] Support for new LaTeX hook management

[Ulrike Fischer]

Hallo Michal,

> I've disabled the \DocumentMetadata command in tex4ht.sty. Thich change needs
> the development version of make4ht because in the stable version, tex4ht.sty
> is not loaded before \documentclass, where \DocumentMetadata should be used.
> The options passed to this command are saved in the \:DocumentMetadata
> command, so it should be possible to process them later.

> This change is necessary to prevent a fatal clash between LaTeX's tagging
> support and TeX4ht. 

Which fatal clash?  Do you have an example?

Ulrike