Rowspan syntax in Markdown

I think I'm a little late, but you can't take it so narrowly. Actually was able to do tricks like this with Joplin using the plugin "MultiMarkdown", because you can use normal HTML markup within the table cells :

|
|1<td rowspan="2">3</td>
|2 
|4|5| 

This is a pretty nasty mix of Markdown and HTML which I'm pretty sure will make some people frown. What results in something like this :

What is very important is that Multimarkdown is not the one that allows this mixture of Markdown and HTML, no it also works with normal Markdown 2.0.

Multimarkdown is actually a table plugin that allows me to omit the header and the extra two cells on the right side.

The closest to what the OP requested, and what I think can be created with vanilla Markdown 2.0 (without MultiMarkdown) would look like this:

|A |B
|--|--
|1<td rowspan="2">3</td>|2
|4|5
|6|7 

As of today, there is no syntax for tables in standard Markdown language. You can find that within some Markdown extensions like MultiMarkdown or Markdown Extra, but no rowspan support.

You can still include html code in your markdown like in this example:

**Hello**
<table>
<tr><td>rowspan1</td><td rowspan="2">rowspan2</td></tr>
<tr><td>rowspan1</td></tr>
</table>
*World*