On Tue, Aug 9, 2011 at 9:19 PM, Daniel Friesen lists@nadir-seen-fire.com wrote:
<h#> tags are not invalid inside of table contents. <tr>'s contents are flow content, and <h#> tags are flow content.
You mean <td>, not <tr>.
<h#> tags are however invalid inside of <th> tags which are phrasing content.
There's a bug open asking to change this, and allow flow content inside <th>: