[accessibility] Designating header cells in tables

[Ulrike Fischer]

>> Ask the Lwarp author what he can support here. It shouldn't be
>> difficult to switch the row type after some trigger command.

> Thank you for the suggestion.

> I ran a quick test with TeX4ht, which also produced TD elements only -
> at least for the example which I tried.

> However, the screen reader with which I evaluated the output recognized
> the table. On the other hand, it didn't read the header cells while 
> navigating among the body cells. This is unsurprising, of course, as the
> headers weren't designated as such.

> Thus the results were somewhat better with TeX4ht, but it still seems to
> me that having means of marking up header cells for purposes of HTML 
> conversion would be useful. I don't remember whether tagged PDF (at 
> least with the standardized element set) distinguishes between header 
> and body cells in a table.


In a tagged pdf one has to mark up the header too. And I quite agree
that one need a better markup that reflects the structure. But it
won't be easy to develop such a markup. There are lots
variants to consider. A header isn't necessarly a simple row.

Ulrike Fischer