On Wed, 10 Nov 2021 11:03:23 GMT, Ludvig Janiuk <d...@openjdk.java.net> wrote:

> Concerning `<tbody>`, quote (emphasis mine):
> 
> > As your tables get a bit more complex in structure, it is useful to give 
> > them more structural definition. One clear way to do this is by using 
> > `<thead>`, `<tfoot>`, and `<tbody>`, which allow you to mark up a header, 
> > footer, and body section for the table.
> 
> > **These elements don't make the table any more accessible to screenreader 
> > users**, and don't result in any visual enhancement on their own. They are 
> > however very useful for styling and layout — acting as useful hooks for 
> > adding CSS to your table.
> 
> Based on this, I don't see a foundation for having several tbodies. Am I 
> missing something?

The definition of [`rowgroup` 
keyword](https://html.spec.whatwg.org/dev/tables.html#attr-th-scope-rowgroup) 
is as follows:
> The row group state means the header cell applies to all the remaining cells 
> in the row group. A `th` element's `scope` attribute must not be in the row 
> group state if the element is not anchored in a row group.

As I read the definition, having `<th scope="rowgroup">` requires that the 
corresponding `th` element is in a row group (`tbody`) and such _a heading 
applies to all the cells in the row group_. Thus, without creating the second 
row group the cell `<th scope="rowgroup">Arabic` from the first row applies to 
all the subsequent cells in the table including `<th scope="rowgroup">Tai Tham`.

[The following 
example](https://html.spec.whatwg.org/dev/tables.html#the-th-element:attr-th-scope-6)
 on that page discusses the same situation: a heading cell with 
`scope="rowgroup"` applies to all the cells in a row group defined by `tbody`. 
Our situation is similar yet the second row group contains only one row.

It's why I think the table must have *two* row groups: for _Arabic_ and for 
_Tai Tham_, even though it doesn't change the visual presentation.

-------------

PR: https://git.openjdk.java.net/jdk/pull/6291

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