* Column spans
* Row spans
- The spec says that if the `val` attribute is ommitted, its value
should be assumed to be `continue`, and that its values are
restricted to {`restart`, `continue`}. If the value has any other
value, I think it seems reasonable to default it to `continue`. It
might cause problems if the spec is extended in the future by adding
a third possible value, in which case this would probably give
incorrect behaviour, and wouldn't error.
* Allow multiple header rows
* Include table description in simple caption
- The table description element is like alt text for a table (along
with the table caption element). It seems like we should include
this somewhere, but I’m not 100% sure how – I’m pairing it with the
simple caption for the moment. (Should it maybe go in the block
caption instead?)
* Detect table captions
- Check for caption paragraph style /and/ either the simple or
complex table field. This means the caption detection fails for
captions which don’t contain a field, as in an example doc I added
as a test. However, I think it’s better to be too conservative: a
missed table caption will still show up as a paragraph next to the
table, whereas if I incorrectly classify something else as a table
caption it could cause havoc by pairing it up with a table it’s
not at all related to, or dropping it entirely.
* Update tests and add new ones
Partially fixes: #6316
56b211120c