[whatwg] Why does <th> allow block-level elements?

Hi,

<th> allows either inline-level content or block-level elements. [1] I know 
that HTML4 allows block-level elements too, but I suspect that might have to 
do with convenience when writing the DTD, actually.

<h1> and <dt> don't allow block-level elements. What's the use-case for 
having block-level elements in <th> that doesn't apply to <h1> or <dt> as 
well?

[1] http://whatwg.org/specs/web-apps/current-work/#the-th

Regards,
Simon Pieters

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